Cosmia Top

Reformation

$168

original retail

Other Ways to Get It

Product Details

Reformation’s Cosmia Top features a breezy peplum silhouette with lace-trimmed tie-front details ideal for warm days. Slip it over denim shorts, add strappy espadrilles, and throw on a floppy straw hat for that effortless summer vibe.

Materials and Measurements

Black (53% Viscose, 47% Cotton). Top. Scoop neck. Sleeveless. Tie front closure. Shoulder to hemline: 25". Imported.

Size and Fit

Sized: XS-XL

The model is wearing a size small.

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Ratings &
Reviews

  (15)  

Includes written reviews and customer fit feedback.

Fit
Runs Small (2)
True to Size (8)
Runs Large (1)

All Photos

Top Contributor
Size worn:
XS
Overall fit:
True to Size
Rented for:
Everyday
Usually wears: 0
Height: 5' 5"
Bust size: 32A
Body type: Hourglass
Weight: 120lbs
Browse Jamie's reviews
October 16th, 2025
Bought it!

Fit was super cute and comfy, and I wasn't scared about it coming undone or flashing a nip

Team RTR
Size worn:
XS
Overall fit:
True to Size
Rented for:
Everyday
Usually wears: 4
Height: 5' 3"
Bust size: 32A
Body type: Petite
Weight: 123lbs
Browse Jessica's reviews
August 18th, 2025
Fits wells!

I love this top. I wish I can keep it, but it's too trendy to buy (which is why I rent). There are three ties in the front. It does feel very secure. The fabric is nice and light. Not at all scratchy. I wore it on a 85 degrees day. Highly recommend!

Top Contributor
Size worn:
XS
Overall fit:
True to Size
Rented for:
Party
Usually wears: 2
Height: 5' 6"
Bust size: 32A
Body type: Straight & narrow
Weight: 110lbs
Browse Carly's reviews
November 12th, 2025
Fun top

Wore this to a party and got lots of compliments

Top Contributor
Size worn:
S
Overall fit:
Large
Rented for:
Party
Usually wears: 4
Height: 5' 7"
Body type: Athletic
Weight: 135lbs
Browse Samantha's reviews
September 13th, 2025
runs little big!

especially for those without a big chest

Top Contributor
Size worn:
XS
Usually wears: 0
Height: 5' 5"
Body type: Straight & narrow
Weight: 112lbs
Browse Abby's reviews
November 22nd, 2025
Cute and comfy

Loved this too, though it was slightly small around the arm holes. It has double layering over the chest so you can go sans bra easily

Top Contributor
Size worn:
S
Overall fit:
True to Size
Rented for:
Everyday
Usually wears: 2
Height: 5' 7"
Bust size: 32D
Body type: Hourglass
Weight: 135lbs
Browse Sc's reviews
August 25th, 2025
loved

a bit snug in the underarms, but a bigger size would have been too big. Very cute, lightweight, perfect for summer top!

Top Contributor
Size worn:
S
Overall fit:
True to Size
Rented for:
Party
Usually wears: 4
Height: 5' 6"
Body type: Athletic
Weight: 130lbs
Browse Zoey's reviews
October 30th, 2025
Cute top

not as flattering as i'd hoped but i liked it

Top Contributor
Size worn:
M
Usually wears: 4
Height: 5' 4"
Bust size: 32C
Body type: Straight & narrow
Weight: 128lbs
Browse Kilee's reviews
September 15th, 2025
Cute

It was cute but sheer and probably should have gone down a size.

Top Contributor
Size worn:
S
Overall fit:
True to Size
Rented for:
Everyday
Usually wears: 4
Height: 5' 5"
Bust size: 34B
Body type: Hourglass
Weight: 145lbs
Browse Noelle's reviews
August 19th, 2025
love!

wore this 3-4 times and got a lot of compliments. elevated basic & was easy to throw on, didn’t need to wear a bra but did wear stickies just in case the ties came loose

Size worn:
XS
Overall fit:
True to Size
Usually wears: 0
Height: 5' 4"
Body type: Athletic
Browse RTR Member's reviews
August 16th, 2025
Cute

Top Contributor
Size worn:
M
Usually wears: 8
Height: 5' 4"
Bust size: 36C
Body type: Hourglass
Weight: 160lbs
Browse Mary's reviews
November 21st, 2025
Doesn't close in the front

Weird fit of you have a larger chest

Top Contributor
Size worn:
S
Usually wears: 4
Height: 5' 8"
Bust size: 36B
Body type: Straight & narrow
Weight: 118lbs
Browse Suzanne's reviews
September 22nd, 2025
open front

if you don't want to show your belly, this top isn't for you :(

Top Contributor
Size worn:
S
Overall fit:
Small
Rented for:
Other
Usually wears: 6
Height: 5' 9"
Bust size: 34B
Body type: Athletic
Weight: 140lbs
Browse Felicia's reviews
November 20th, 2025
Fits weird

The front opening does not come together closely enough, leaving a noticeable gap

Top Contributor
Size worn:
S
Overall fit:
True to Size
Rented for:
Everyday
Usually wears: 4
Height: 5' 6"
Bust size: 32DD
Body type: Hourglass
Weight: 135lbs
Browse Natasha's reviews
September 16th, 2025
Not for me

I thought this would be kind of a cute sexy, sexy shirt because I’m on the leaner side right now, but I was too chesty for it and it looked matronly like I would be breast-feeding in it

Top Contributor
Size worn:
S
Overall fit:
Small
Rented for:
Other
Usually wears: 4
Height: 5' 7"
Bust size: 32D
Body type: Straight & narrow
Weight: 145lbs
Browse Alexis 's reviews
July 28th, 2025
Frumpy

Nothing special and wasn’t flattering

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