Some good suggestions here. I'm not going to go into detail for each one of them but all of them will be considered. Also:
That is correct. Clothes don't have thumbnails for performance reasons (especially loading time). You may think it doesn't make a big difference because we already have so many thumbnails, but let me tell you that we have roughly 1300 clothing pieces in the shop, so that would be another 1300 thumbnails, which, well, is a lot.