Someone thinks they are a model. Or maybe have a sideline in 'other services'. It happens from time to time on Ebay, some buyers don't mind if they are buying clothes that have clearly been used and some will buy used clothing only if it isn't shown on someone else. I have seen some awful attempts at modelling garments on there over the years.Some similar to the trashed shoe sellers.
There used to be a woman that posed with the clothing on and it was clearly several sizes too small for her, there were bits of her person hanging out all over the place and the members of the old Q&A forum used to joke about it. She got sales although no-one was sure who bought the items or if they came with 'extras'.