We don’t use eBay here, so I’m not qualified to give an opinion on it. We do have a very good online market though (Mercado Livre). When buying clothing and some other items (it can be used or new), the buyer usually have a month to return the product and get a refund. I do like this, as I’ve returned a dress it didn’t fit. Obviously you need to return it exactly as they send it (so if there’s indication that it has been used it would fit the policy, but I don’t know what happens, as I never did something of the sort).