The flaw is already in your photographs.
Vinted lets you upload up to twenty photographs, and most sellers upload plenty enough to show the mark they did not mention. That is the specific trap. The bobbling on the sleeve is there in the fourth picture, the description says "good condition", and the gap between those two things is the whole of an item-not-as-described claim. The buyer is not comparing your jumper against a perfect one. They are comparing it against your description of it.
Which makes disclosure worth more here than polish. A flaw named properly — where it sits, how big it is, whether it shows when the thing is worn — becomes a reason to believe the rest of the listing, and on a platform where nobody has a rating you can read at a glance, that is close to the only currency there is. A flaw left out becomes a return, and the postage on a return costs more than the honesty would have.
A size 12 is not a measurement
The other thing that decides whether an item comes back is sizing, and it is genuinely not the seller's fault: a 12 from one label and a 12 from another can sit two dress sizes apart, and there is no universal chart behind the field to reconcile them. The label size is a starting point. Chest, waist and length measured flat are what a buyer can check against something already in their wardrobe. This tool will not estimate one from the other — a guessed measurement is worse than a blank, because a blank prompts a question and a guess prompts a dispute — so anything you have not put a tape to comes back as [ADD FACT] with the measurement named.
What else it looks for
Whether a brand you did not select has been named in the description, since comparing the fit to another label breaches the catalogue rules and can take the listing down — and it is precisely the helpful-sounding line a rewrite would otherwise add for you. Whether the condition you chose from the dropdown matches the condition you then described, because new with tags is a factual claim rather than an aspiration. Whether the title carries the brand, the item and the size, or leans on "nice" and "lovely", which nobody has ever typed into a search box. Whether the material and the care label get a mention where they would change somebody's mind. Whether bundling is invited, that being how buyers here bring their own costs down and the most common reason a second item sells. And whether you are selling privately or trading, because the obligations differ and the listing should not imply the wrong set.
What a fix looks like
As suppliedNice jumper size 12. Lovely jumper, worn a couple of times, good condition. Similar to a Zara one I had. Bundle for postage!
What comes backCos Wool-Blend Jumper Oatmeal UK 12. Cos wool-blend jumper in oatmeal, UK size 12. Measured flat: chest [ADD FACT], length [ADD FACT]. Worn [ADD FACT: roughly how many times]. Condition [ADD FACT: say plainly whether there is any pilling, bobbling or mark, or confirm none is visible]. Care label [ADD FACT: confirm the wash instruction]. Happy to bundle — message me before you buy and I will combine the postage.
The Zara comparison went because it is a removal risk rather than a helpful aside. "Nice" became the brand, the material, the colour and the size, which are the four things somebody was actually searching for. And "good condition" was neither upgraded nor softened: it became a question only the seller, standing in front of the jumper, can answer.
