COS Midi Dresses Resale Value

COS midi dresses: price by condition

Seller-declared grades, sterling with an approximate US dollar equivalent at £1 ≈ $1.33 (July 2026). What each grade means.

What holds its value across COS

• Oversized wool and wool-blend coats, which are the label’s signature and the thing buyers search it for by name
• Archive and limited-edition pieces, which are produced in small runs and are the only part of the range with a collectors’ element
• Plain, structured tailoring in neutral colours, which dates far more slowly than anything printed and stays saleable for years
• Heavier knitwear in merino and wool blends, which holds its shape where the cheaper high-street equivalents do not

What pulls COS resale value down

• Pilled knitwear, which is the commonest fault and shows immediately against the plain colours the label favours
• Faded blacks and washed-out greys, which are most of the range and where fading is most obvious
• Anything with a broken or replaced signature button or fastening, since the hardware is deliberately minimal and any substitute shows
• Basic jersey pieces, which are cheap enough new that a used one rarely justifies the postage on its own

Identifying and dating yours

1. The neck label reads COS rather than any sub-line, and the care label carries a product code buyers can search to confirm the season
2. COS sizing runs large and is cut deliberately oversized, so give flat measurements — buyers who have not worn the label before consistently order wrong
3. Photograph the shoulder seams and the inside of the coat, because the construction is most of why somebody chooses this label secondhand

What lifts any midi dress, whatever the label

Midi dresses sell year-round, which makes them one of the more reliable clothing categories, though supply is heavy.

• Recognisable brands with a resale following
• Structured fabrics that hold their shape
• Working zips and intact linings
• Classic cuts that are not tied to one season

And what pulls one down

• Bobbling on knitted and jersey fabrics
• Underarm marks and deodorant staining
• Stretched necklines and hems
• Very trend-specific styles

Working out what yours is worth

1. Check underarms and neckline closely in daylight
2. De-bobble knitted fabrics before photographing
3. Measure bust, waist and length

What to state in the listing

• Shoulder-to-hem length in centimetres
• Bust, waist and hip measured flat
• Whether it is lined, and the fabric composition
• Zip or button fastening, and whether it has pockets

Style, fabric and size: “Floral Midi Wrap Dress, Size 12, Lined”. Length is what the word midi promises, so give the actual centimetres in the description — on different heights a midi becomes a maxi or a midi becomes a knee-length, and that is what drives returns.

Preparing and photographing it

1. Measure the full length from the shoulder seam to the hem, plus bust, waist and hip laid flat.
2. Check the zip runs cleanly and look for underarm staining, which is the most common reason a dress is unsellable.
3. Read the composition and care label, and note whether it is lined.

1. The dress on a hanger, full length, front
2. Flat with a tape showing the shoulder-to-hem length
3. The fabric close up, showing texture and pattern accurately
4. The zip, the lining, and any stain, snag or pull

When it sells best, and handing it over

Strongest from March to August, with a second lift before the party season. Off-season listings sell noticeably slower.

Light and cheap to post. Fold with tissue in the creases if the fabric is prone to wrinkling and say you have done so.

What buyers ask

Does COS clothing hold its value?

Reasonably, and better than most of the high street, because the designs are plain enough not to date. Coats and tailoring do best; plain jersey basics are barely worth listing on their own.

What size should I list a COS coat as?

Give the label size and the flat measurements together. COS is cut oversized and the label size alone misleads more buyers on this brand than on almost any other.

How much is a COS midi dress worth?

Roughly £12 to £50 depending on condition, against £12 to £50 for midi dresses generally. The identification points above are what move a listing to the top of that range.

What the fees would take elsewhere

At the mid-range £31 for a COS midi dress, against what the commission marketplaces would deduct:

Seller-side rates verified 26 Jul 2026, percentages only — the per-order and processing charges those platforms add are excluded, so the real gap is wider.

Listing is free and there is no commission — read how to sell a midi dress for the title, handover and timing, or the general midi dress value guide if yours is not a COS.

See also: all COS value guides · value guides by brand · buying a midi dress · Clothing · condition grades.