Sienna Oversized Cotton V Neck Sweater

Reformation

4
(19 Reviews)

Product Details

The Sienna Oversized Cotton V-Neck Sweater by Reformation is a relaxed-fit sweater crafted from soft, breathable cotton. It features a deep V-neckline, ribbed detailing, and an oversized silhouette for effortless layering and casual elegance.

Materials and Measurements

Brown (100% Organically Grown Cotton). Knit. V neck. Long Sleeve. Pull on. Shoulder to hemline: 25". Imported.

Size and Fit

Sized: XS-L

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

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Ratings &
Reviews

  (19)  

Includes written reviews and customer fit feedback.

Fit
Runs Small
True to Size
Runs Large

All Photos

Top Contributor
Size worn:
S
Overall fit:
True to Size
Usually wears: 2
Height: 5' 6"
Bust size: 34DD
Body type: Athletic
Weight: 118lbs
Browse Kara's reviews
April 29th, 2025
Warm, quality, comfy

Nothing super exciting but fits the classic trend, I wore rtr boyfriend shirt with rtr jeans, super fresh!

Overall Fit

Just right

Top Contributor
Size worn:
L
Overall fit:
Large
Rented for:
Everyday
Usually wears: 12
Height: 6' 0"
Bust size: 38A
Body type: Pear
Weight: 190lbs
Browse Elisa's reviews
February 24th, 2025
Casual sweater runs large

Great look and quality. If you’re looking for a more fitted look, size down. I have long arms and these were plenty long enough.

Top Contributor
Size worn:
XS
Overall fit:
True to Size
Rented for:
Everyday
Usually wears: 4
Height: 5' 5"
Bust size: 32D
Body type: Athletic
Weight: 130lbs
Browse Jasmine's reviews
May 21st, 2025
simple sweater, nothing special

Wide v neck that sits awkward on the shoulder. Simple sweater perfect for casual wear

Top Contributor
Size worn:
M
Overall fit:
Large
Usually wears: 10
Height: 5' 7"
Bust size: 32H
Body type: Full Bust
Weight: 150lbs
Browse Elizabeth's reviews
June 25th, 2025
Perfect summer sweater

I wore this so many times, it goes with anything and looks great over shorts, work pants, leggings or dresses. I tossed it in my bag and wore it all over town

Overall Fit

Runs big

Chest

Just right

Arms & Shoulders

Just right

Waist

Just right

Length

Just right

Top Contributor
Size worn:
XS
Overall fit:
Large
Usually wears: 4
Height: 5' 2"
Body type: Petite
Weight: 130lbs
Browse Sarah's reviews
May 9th, 2025
Super cute

Great oversized sweater, casual fit easy to dress up or down

Overall Fit

Runs big

Top Contributor
Size worn:
L
Overall fit:
Large
Usually wears: 8
Height: 5' 8"
Bust size: 36D
Body type: Hourglass
Weight: 160lbs
Browse Amelia's reviews
May 7th, 2025
Perfect staple sweater for layering

Wrote it traveling, on a date and then generally out and about. Adorable slightly oversized sweater, great for layering in transitional weather. Might buy it.

Overall Fit

Runs big

Chest

Runs big

Arms & Shoulders

Runs big

Waist

Runs big

Length

Just right

Top Contributor
Size worn:
L
Overall fit:
Large
Usually wears: 8
Height: 5' 9"
Bust size: 36B
Body type: Athletic
Weight: 164lbs
Browse Mary 's reviews
March 20th, 2025
Adore

Cuter fit than pictured! Perfect for the weird in between weather! Cold beach vibes! Loved so cozy

Overall Fit

Runs big

Top Contributor
Size worn:
M
Overall fit:
True to Size
Rented for:
Everyday
Usually wears: 10
Height: 5' 6"
Bust size: 38C
Body type: Hourglass
Weight: 165lbs
Browse Jennifer's reviews
May 24th, 2025
Love it, bought it!

Soft, easy, comfortable, will wear over and over again!

Top Contributor
Size worn:
M
Overall fit:
Large
Usually wears: 8
Height: 5' 4"
Bust size: 36DD
Body type: Full Bust
Weight: 150lbs
Browse Caitlin's reviews
March 28th, 2025
Great classic sweater

Cozy. Classic. Would rent again

Overall Fit

Runs big

Top Contributor
Size worn:
S
Overall fit:
True to Size
Rented for:
Everyday
Usually wears: 6
Height: 5' 7"
Body type: Straight & narrow
Weight: 135lbs
Browse Anna's reviews
July 1st, 2025
Love this for work!

Top Contributor
Size worn:
S
Overall fit:
True to Size
Usually wears: 6
Height: 5' 4"
Bust size: 32DDD/E
Body type: Hourglass
Weight: 150lbs
Browse Annie's reviews
March 22nd, 2025
Cute fall/spring sweater

I'm docking a star because the cream is a little on the yellow side and so it washed me out. Cute casual vibes, not very elevated and the knit is a little starchy.

Overall Fit

Just right

Top Contributor
Size worn:
L
Overall fit:
True to Size
Rented for:
Everyday
Usually wears: 10
Height: 5' 4"
Bust size: 34DD
Body type: Apple
Weight: 160lbs
Browse Amy's reviews
May 13th, 2025
Wore and wore and wore

I wore this on a flight and it was cooler than expected at my destination so I wore this nearly daily for 5 days! Good thing I didn't spill anything. Oversized fit, thick cotton. Low V but worked for me.

Top Contributor
Size worn:
L
Overall fit:
Large
Rented for:
Everyday
Usually wears: 12
Height: 5' 4"
Bust size: 38DDD/E
Body type: Hourglass
Weight: 180lbs
Browse Monica's reviews
March 24th, 2025
Swimming

I ordered a large knowing it is oversized. I was swimming in this. Could have gone medium.

Top Contributor
Size worn:
L
Overall fit:
Large
Rented for:
Everyday
Usually wears: 12
Height: 5' 9"
Bust size: 38D
Body type: Apple
Weight: 150lbs
Browse Laura's reviews
March 3rd, 2025
Size WAY down

Very big but great casual sweater you should size down at least one and maybe two sizes, even for an oversize look!

Top Contributor
Size worn:
M
Overall fit:
True to Size
Usually wears: 10
Height: 5' 6"
Body type: Athletic
Browse Marci 's reviews
March 4th, 2025
Just okay--the bottom looks stretched out

Overall Fit

Just right

Top Contributor
Size worn:
S
Overall fit:
Large
Usually wears: 2
Height: 5' 8"
Bust size: 32DD
Body type: Straight & narrow
Weight: 122lbs
Browse Renee's reviews
February 11th, 2025
Average

Oversized sweater that did not wow me. Loved that it was 100% cotton, but I didn't find it flattering.

Overall Fit

Runs big

Top Contributor
Size worn:
L
Overall fit:
True to Size
Usually wears: 6
Height: 5' 7"
Bust size: 32D
Body type: Hourglass
Weight: 145lbs
Browse Carolina's reviews
April 26th, 2025
Solid Sweater, Nothing Fancy

Top Contributor
Size worn:
S
Overall fit:
True to Size
Usually wears: 4
Height: 5' 3"
Bust size: 32C
Body type: Petite
Weight: 130lbs
Browse Elena's reviews
April 25th, 2025
Not a fan of the yellow color, stiff material.

Top Contributor
Size worn:
M
Overall fit:
Large
Usually wears: 8
Height: 5' 8"
Bust size: 34D
Body type: Straight & narrow
Weight: 150lbs
Browse Carrie's reviews
April 9th, 2025
slovenly

this is an oversized boxy fit, and looks very sloppy on

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