Model faces forward in the black classic cotton cap, worn with a matching set

Back view of the black cotton default cap on the model with a low ponytail

Close detail of the cotton texture on the black cotton default cap

Model runs errands in the black cotton default cap, hoodie and leggings

Extras · Drop 01

Gloss

Classic Cotton Cap – Onyx

Arrives in 6–13 business daysTracked from our partner warehouse, with updates by email.

Secure checkoutEncrypted, handled by Shopify
30-day returnsUnworn with tags on
Pay laterInterest-free installments where available
Real humansReplies within 1 business day

Black, structured and pulled low. This 100% cotton cap finishes any set, from a sweaty 7 am class to a sunglasses-on errand run.

01All cotton Made from 100% cotton for an easy, comfortable feel.

02Holds its shape A structured build keeps the silhouette clean.

03Black goes with all Pair it with any set, plus a long coat for travel.

04Off-duty finish Add it to leggings and a hoodie for errands.

Size & fit

Runs true to size. Rei is 5'7" and wears size one size.

A structured cap with a clean shape.

One size.

Between sizes? Size up for a softer hold, size down for maximum sculpt.

Fabric & care

100% cotton. See label for care. Imported.

Shipping & returns

Ships from our partner warehouse with tracking. Orders are processed in 1 to 5 business days, then delivery takes 5 to 8 business days. US shipping is $5.99 and international is $8.90, and both are free on orders of $75 or more.

30-day returns on unworn pieces with tags. Email us first and we'll send the return address.

Shipping policy · Refund policy

Payment & installments

Pay with card, Shop Pay, Apple Pay or Google Pay. Eligible US orders can be split into interest-free installments with Shop Pay at checkout, subject to approval.

Size guide

Rei is 5'7" and wears size one size.

Find your size in 30 seconds. These are body measurements, not garment measurements. If you're between sizes, size up for a softer hold or size down for maximum sculpt.

Tops, sets, dresses and leggings

Size	US	UK	EU	Bust	Waist	Hips
XS	0–2	4–6	32–34	31–32 in 79–82 cm	24–25 in 61–64 cm	34–35 in 86–89 cm
S	4–6	8–10	36–38	33–34 in 84–87 cm	26–27 in 66–69 cm	36–37 in 91–94 cm
M	8–10	12–14	40–42	35–36 in 89–92 cm	28–29 in 71–74 cm	38–39 in 97–99 cm
L	12–14	16–18	44–46	37–39 in 94–99 cm	30–32 in 76–81 cm	40–42 in 102–107 cm
XL	16	20	48	40–42 in 102–107 cm	33–35 in 84–89 cm	43–45 in 109–114 cm

How to measure

Bust: around the fullest part of your chest, tape level across your back.
Waist: around the narrowest part of your waist, usually just above the belly button.
Hips: around the fullest part of your hips and seat, feet together.

Keep the tape snug but not tight. Measure over light underwear, not over clothes.

How our pieces fit

Sculpt (leggings, bandeau and crop sets): second-skin compression. Pick your usual size for a firm hold.
Court and Club (tennis and mini dresses): fitted through the bust and waist. Go by your bust if you're between sizes.
Lounge and Layers (hoodies, joggers, puffers): relaxed. Size down for a closer fit.

Each product page shows the model's height and the size she's wearing. Still unsure? Email active@oomel.com with your measurements and we'll recommend a size.