I started to purchase from thread up because was in the process of loosing weight and didn't want to overspend on clothes that I would only wear for a few months. To my surprise the clothes were amazing and I continued to purchase from Thread Up even after I reached my goal weight. Of course you have to be realistic because you are buying used clothing so I don't expect perfection but for the most part I have been thoroughly impressed with the quality of the garments that I have received. My suggestions for a great shopping experience are:
1 - Start buy searching through the "new with tag" section you can always find a great deal for a brand new item.
2- Read the details about the garment especially the tiny flaw section they are very honest about imperfection
3- Be frugal but DON'T BE CHEAP - you are getting a steal but don't think that you are going to get the absolute best for $5 be realistic!
By employing those 3 steps I have gotten some amazing pieces and continue to fill my closet for a steal. I'm addicted to the polka dot box - Thanks Thread UP for this awesome service.