Black Kourtney Dress

Reformation

4
(59 Reviews)

Product Details

The Kourtney Dress by Reformation combines effortless style with timeless elegance. This chic midi dress features a fitted bodice, sweetheart neckline, and adjustable spaghetti straps for a flattering fit. The flared skirt and delicate floral print add a touch of femininity, making it perfect for everything from garden parties to evening events.

Materials and Measurements

Black floral (100% Viscose). Cocktail Dress. Sweetheart Neck. Sleeveless. Back zip closure. Slit. Imported.

Size and Fit

Sized: 

The model is 5'10" and wearing a size 4.

Share

Ratings &
Reviews

  (59)  

Includes written reviews and customer fit feedback.

Fit
Runs Small
True to Size
Runs Large

All Photos

Top Contributor
Size worn:
4
Overall fit:
True to Size
Rented for:
Party
Usually wears: 4
Height: 5' 2"
Bust size: 32B
Body type: Hourglass
Weight: 120lbs
Browse Christine's reviews
June 4th, 2025
Great dress to dress up or down!

Rented this for my daughter to attend her friend’s Bat Mitzvah evening celebration. It was a perfect fit (she’s only 4’ 11”) and she felt beautiful while maintaining modesty and age appropriate. She’d love for me to buy this one!

Top Contributor
Size worn:
4
Overall fit:
Small
Usually wears: 2
Height: 5' 10"
Bust size: 32D
Body type: Straight & narrow
Weight: 135lbs
Browse Elizabeth's reviews
April 4th, 2025
Insane slit

I'm not shy about showing some skin but this was seriously so much leg and cleavage - especially bc it runs small. I'm a pretty solid 2 and went up the 4 based on reviews...I could have easily worn a 6. That being said it's a beautiful dress, I felt like Jessica Rabbit, and got tons of compliments. Would rent again (but in a 6 next time)

Overall Fit

Runs small

Chest

Runs small

Top Contributor
Size worn:
6
Overall fit:
True to Size
Usually wears: 2
Height: 5' 8"
Bust size: 34C
Body type: Athletic
Weight: 130lbs
Browse Ellie's reviews
December 19th, 2024
Great party dress

Finally a dress from reformation that fits true to size!! This was great for a holiday party, flattering and comfy. The only thing to be aware of is the semi circle design thing on the boobs is small so your boobs won't fit that correctly if you have a larger chest but it really wasn't noticeable

Overall Fit

Just right

Top Contributor
Size worn:
2
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 2
Height: 5' 3"
Bust size: 34B
Body type: Hourglass
Weight: 125lbs
Browse Alexa's reviews
August 20th, 2025
Backup dress came in clutch

Originally wore a different dress to the wedding but when both straps broke, I luckily had this one as back up in my car. This dress was so comfortable and I thought the fit was very flattering. Nothing like a good outfit change.

Size worn:
10
Overall fit:
True to Size
Rented for:
Date
Usually wears: 8
Height: 5' 6"
Bust size: 36DD
Body type: Hourglass
Weight: 170lbs
Browse RTR Member's reviews
November 24th, 2024
She’s a keeper

My husband told me to buy this dress! It fit so well and I felt beautiful!! I’m a standard 8 in clothes but formal dresses I’m mostly a 10. So this was spot on. I have a big bust and big booty. So it kept me feeling secure in all the right place but also sexy.

Size worn:
4
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 4
Height: 5' 6"
Body type: Apple
Weight: 127lbs
Browse Caroline's reviews
October 29th, 2024
Loved it!!

Perfect for an evening wedding :) My only note is that the slit can go pretty high/ move unpredictably, so I recommend using a small safety pin to keep everything in place!

Size worn:
6
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 4
Height: 5' 10"
Bust size: 34AA
Body type: Straight & narrow
Weight: 135lbs
Browse RTR Member's reviews
October 7th, 2024
Great fall wedding dress

This dress was great! The 4 also fit but the slit was too high and center alighed. The 6 ended up fitting better apart from me not having much in the chest department, and the slit hit more to the side compared to the 4. I sometimes size up because of my shoulders being wider for how skinny I am which leads to dresses not fitting as well but the adjustable straps solved this problem and also accomidated my long torso. Very flattering fit and made me look slightly more curvey which I appreciated.

Size worn:
8
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 6
Height: 5' 2"
Bust size: 32D
Body type: Hourglass
Weight: 130lbs
Browse RTR Member's reviews
August 15th, 2024
Great dress

This dress was beautiful! I got lots of compliments on it. I ordered a size 6 and 8 and ended up wearing the 8 to have a little bit of breathing room (the dress has no stretch to it)

Top Contributor
Size worn:
10
Overall fit:
True to Size
Rented for:
Formal Affair
Usually wears: 8
Height: 5' 8"
Bust size: 34D
Body type: Hourglass
Weight: 145lbs
Browse Jessica's reviews
August 14th, 2024
This dress is a show stopper.

This dress was stunning on! I felt sexy and confident and received so many compliments. I did size up. I am 5’8” and 150 lbs. I usually wear a size8 but got a size 10 in this dress and it fit like a glove. The straps are bit thin and I did wear the sticky boomba inserts to avoid any slips and that worked perfectly. 10/10 would recommend. I wanted to buy this dress after one wear

Top Contributor
Size worn:
4
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 4
Height: 5' 8"
Bust size: 34A
Body type: Athletic
Weight: 130lbs
Browse RTR Member's reviews
August 3rd, 2024
LOVED IT

What a fabulous dress. Sexy without being too much, fantastic for dancing, hid all the spots I wanted hidden... my only complaint was the straps. If you have a larger bust, I think it would be pretty painful. As it is, I had someone else help me tie the straps criss-cross in the back, rather than over my shoulders because it felt very insecure tied at the shoulders. If you have someone to help tie you in, it's the perfect dress for a summer wedding!

Size worn:
0
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 0
Height: 5' 2"
Bust size: 32A
Body type: Athletic
Browse Maggie's reviews
July 31st, 2024
Great dress!

Perfect dress for a wedding, fit great. Straps are very thin but I loved that they are adjustable.

Top Contributor
Size worn:
12
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 10
Height: 5' 11"
Bust size: 38B
Body type: Athletic
Weight: 165lbs
Browse Kristin's reviews
July 25th, 2024
Sized up

Maybe I’m just getting bigger but the 10 was too tight and the 12 was just right. Gorgeous dress!

Top Contributor
Size worn:
8
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 8
Height: 5' 7"
Bust size: 34B
Body type: Hourglass
Browse Maddy's reviews
August 26th, 2025
Wedding Guest Dress

Great wedding guest dress. Slit made me a little nervous at times but never exposed anything (lol). Would consider renting again for a future event!

Top Contributor
Size worn:
4
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 4
Height: 5' 5"
Bust size: 34A
Body type: Hourglass
Weight: 115lbs
Browse Hayley's reviews
August 17th, 2025
Fit like a glove but beware the slit

I loved this dress! It fit like a glove but please beware of the slit. It’s very severe! I tried to use fashion tape to keep it a bit more together but that didn’t really work. Just be aware of the slit when sitting down and getting up.

Top Contributor
Size worn:
8
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 6
Height: 5' 7"
Bust size: 34A
Body type: Athletic
Weight: 150lbs
Browse Ali's reviews
August 14th, 2025
Super cute dress for semi-formal wedding

This dress is super cute and although the slit is very high, it was actually super helpful on a very hot day! I did need to use fashion tape and silicone bra cups to help the top fit nicely. My normal size 6 was too tight in the hips so I did size up to the 8. I will note the straps weren’t my favorite since the length of them was weird when tying.

Top Contributor
Size worn:
6
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 6
Height: 5' 9"
Bust size: 34B
Body type: Straight & narrow
Browse Jenny's reviews
September 22nd, 2024
Good dress

Wanted another reformation dress that was not available so I opted for this and it was good, but not as good as the other style. Did the job! Just was use to the other one which was perfect

Top Contributor
Size worn:
6
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 6
Height: 5' 10"
Bust size: 34B
Body type: Straight & narrow
Weight: 150lbs
Browse Jordan's reviews
September 19th, 2024
Super pretty dress, my only complain is that the slot is unusually high!

I loved the look of this dress! Reformation definitely runs on the smaller side so it was a tad bit snug but I still wore my normal size. I think the next size up would have been a tad too roomy. The main issue here is that the leg slit goes up really high - way more than a normal slit in my opinion. It wasn’t a problem when I was standing or dancing, but sitting down was an issue. I wore spandex shorts underneath and had to make sure my lap was covered with a table linen at dinner. Overall it’s still a good dress for a cocktail attire wedding!

Size worn:
6
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 4
Height: 5' 6"
Bust size: 32B
Body type: Athletic
Weight: 140lbs
Browse Caitlyn's reviews
September 7th, 2024
floral and flirty

Gorgeous material and fits like a glove! A great option for a wedding guest dress. Perfect in between for formal and cocktail. A few cons - the zipper is difficult to use, you will need help tying the straps, and sizing up is a must (I am normally a 4 and the slit came up way too high, the 6 was great!)

Top Contributor
Size worn:
4
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 0
Height: 5' 4"
Bust size: 34B
Body type: Petite
Weight: 110lbs
Browse RTR Member's reviews
July 26th, 2024
Looks good but size up!

Originally rented my typical sizes (0&2) but was too small. A 2 'fit' but was just a little tight and didn't feel supported in the bust (breastfeeding mamma, so bigger than normal) The 4 was an overall better fit. Great pattern but didn't expect the slit to go all the way up, kinda hard to sit without exposing everything.

Top Contributor
Size worn:
0
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 0
Height: 5' 3"
Bust size: 32A
Body type: Petite
Weight: 105lbs
Browse Amy's reviews
July 9th, 2024
Pretty dress

The slit is high but not overly sexy. My only complaint is that the straps are a bit thin and can cause chafing, but I would rent this dress again.

Top Contributor
Size worn:
6
Overall fit:
True to Size
Usually wears: 0
Height: 5' 4"
Bust size: 32D
Body type: Petite
Weight: 120lbs
Browse Jennifer's reviews
February 11th, 2025
Loved this dress

Showed off all the right curves the slit was pretty high, but I didn't mind it or for dinner and would rent again

Overall Fit

Just right

Top Contributor
Size worn:
10
Overall fit:
True to Size
Usually wears: 6
Height: 5' 9"
Bust size: 34C
Body type: Athletic
Weight: 138lbs
Browse Brooke's reviews
September 9th, 2025
Beautiful dress! Great structured bodice and sexy neckline.

Top Contributor
Size worn:
6
Overall fit:
Large
Rented for:
Formal Affair
Usually wears: 4
Height: 5' 0"
Bust size: 34D
Body type: Full Bust
Weight: 113lbs
Browse Luisa's reviews
September 3rd, 2025
Wore with a belt

Slight loose and had to put a belt on with it

Top Contributor
Size worn:
0
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 2
Height: 5' 7"
Bust size: 32A
Body type: Straight & narrow
Weight: 115lbs
Browse Ali's reviews
August 1st, 2025
Extremely cute and flattering

Slit was a little high so had to be cognizant of that but overall very cute and perfect for a wedding guest

Size worn:
0
Overall fit:
True to Size
Rented for:
Party
Usually wears: 0
Height: 5' 5"
Body type: Athletic
Browse RTR Member's reviews
April 8th, 2025
Fits so nicely

I felt so secure and put together in this dress. I wore it to my spring sorority formal; it was the perfect vibe for the event! Super comfortable too. The slit goes a little higher than anticipated but just need to be careful with movements.

Size worn:
4
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 2
Height: 5' 6"
Bust size: 34B
Body type: Hourglass
Weight: 135lbs
Browse Ashleigh's reviews
October 4th, 2024
Perfect for spring/summer wedding

Love this dress. Fits true to size. The zipper was nearly impossible to get all the way up even with a second person helping. The trick is to let the straps down, zip, and then put the straps back up. Side slit is pretty high so not the most appropriate for a more conservative event. I actually end up not wearing it for this reason and I thought the florals were more spring/summer vibe than the fall wedding I went to so I went with something else, but I would definitely rent this dress again.

Top Contributor
Size worn:
4
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 6
Height: 5' 8"
Bust size: 34B
Body type: Athletic
Weight: 145lbs
Browse Mary's reviews
October 2nd, 2024
Gorgeous dress, perfect fit!

Size worn:
12
Overall fit:
True to Size
Rented for:
Party
Usually wears: 12
Height: 5' 6"
Bust size: 38B
Body type: Apple
Weight: 160lbs
Browse RTR Member's reviews
September 12th, 2024
Beautiful dress

I wore this to a formal 50th birthday party. It fit as expected. Very happy with my first rental!

Top Contributor
Size worn:
6
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 4
Height: 5' 3"
Bust size: 36C
Body type: Athletic
Weight: 140lbs
Browse Jasmine's reviews
August 26th, 2024
adorable

took a bit to get the zipper up but once it was up, it was beautiful!

Top Contributor
Size worn:
6
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 4
Height: 5' 3"
Bust size: 34B
Body type: Athletic
Weight: 127lbs
Browse Jessica's reviews
August 25th, 2024
Super flattering

So flattering that I immediately bought a used version of this dress on postmark the week after I rented it. Love it!

Top Contributor
Size worn:
2
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 0
Height: 5' 2"
Bust size: 32B
Body type: Petite
Weight: 105lbs
Browse Claire's reviews
August 21st, 2024
Adorable Style, Consider Sizing Up

This dress is simple yet sexy. The print is beautiful. It was perfect for an August wedding in California. I’m usually a 0P in most styles. For this dress, I could fit in the 0, but the 2 was a lot more comfortable so I went with that. I was able to wear a strapless bra with it too. I would rent this dress again.

Size worn:
2
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 2
Height: 5' 3"
Bust size: 30A
Body type: Petite
Weight: 110lbs
Browse Sarah's reviews
August 6th, 2024
Tight fitting, shows off figure w/o restricting breathing because of the stretchy back

Fit perfectly and how I expected. Loved the tie straps so I could adjust.

Top Contributor
Size worn:
4
Overall fit:
True to Size
Usually wears: 2
Height: 5' 6"
Bust size: 32C
Body type: Athletic
Weight: 120lbs
Browse Mandy's reviews
February 21st, 2025
LOVE! I wanted to buy it, perfect fit!

Overall Fit

Just right

Top Contributor
Size worn:
6
Overall fit:
True to Size
Rented for:
Date
Usually wears: 6
Height: 5' 5"
Bust size: 34DDD/E
Body type: Full Bust
Weight: 135lbs
Browse Leah's reviews
February 17th, 2025
So flattering!

Top Contributor
Size worn:
2
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 0
Height: 5' 2"
Body type: Petite
Browse RTR Member's reviews
September 2nd, 2024
Loved it. Received so many compliments. So flattering

Size worn:
12
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 10
Height: 5' 10"
Bust size: 36B
Body type: Pear
Weight: 180lbs
Browse RTR Member's reviews
August 24th, 2024
Very flattering

This dress snitches you at the waist.

Top Contributor
Size worn:
10
Overall fit:
True to Size
Usually wears: 10
Height: 5' 9"
Bust size: 36B
Body type: Athletic
Weight: 160lbs
Browse Alyssa's reviews
April 30th, 2025
Great dress! Fit like a glove. Only problem was the straps tied into a bow and they kept loosening

Overall Fit

Just right

Top Contributor
Size worn:
8
Overall fit:
Small
Usually wears: 6
Height: 5' 4"
Bust size: 34B
Body type: Pear
Weight: 135lbs
Browse Crystal's reviews
December 17th, 2024
Slit is almost too revealing and moves to front of legs but pretty dress

Overall Fit

Runs small

Size worn:
8
Overall fit:
True to Size
Rented for:
Wedding
Usually wears: 8
Height: 5' 8"
Bust size: 36C
Body type: Hourglass
Weight: 145lbs
Browse RTR Member's reviews
August 29th, 2025
I loved the dress overall, and felt beautiful in it!

I love to dance, and there was nonstop dancing at this wedding. Things to note, were the chest part seemed to fit perfectly initially, but it def rode up as I moved and danced through the night, so I had to adjust the girls pretty frequently. Also, the slit is quite high. I chose to wear short lycra underneath, which many people might think is weird, but I felt pretty exposed if not (it was also rather windy where I was). I still very much loved the dress!

Top Contributor
Size worn:
4
Overall fit:
Small
Usually wears: 4
Height: 5' 5"
Bust size: 32DD
Body type: Athletic
Weight: 130lbs
Browse Katelyn's reviews
August 16th, 2025
Way Too Small

Size up. It’s sooooo tight around the chest and ribcage. The slit goes all the way up to the hipbone, so be sure to have some safety pins ready.

See more reviews:
1 / 2

Here to brighten up your inbox.

Emails are the fastest way to learn about new styles, sales, and more.