I’ve had the opposite problem - being accused of having worn something I was returning to a shop when I most certainly had not. It was a top - apparently it smelt! I can’t tell you how furious I was, not to mention embarrassed and humiliated in a busy shop with a queue behind me. I will only try things on fresh from the bath so I knew it wasn’t true (and, of course, being a laydee, I never smell!) - could have been from someone trying it on in the shop before I bought it but I think I would have noticed. Another reason I usually buy items to try at home rather than try in the changing rooms, apart from to see them with other clothes or in different lights, is so I can remove face make-up which could transfer to the neckline, for example. Seems many other people are not so careful as I quite often see tops on racks with orange foundation marks.
Anyway, from what we read on here, I think we all know by now that QVC’s standards for checking items before re-selling are very low. How they can continue to deny they re-sell used and unchecked items, I have no idea.