I have been buying my clothes from them for a probably three or more years, and I was hooked from the first purchase.
I love buying second hand, and I have been going to consignments shops for quite a while now. At first I felt a bit apprehensive about buying second hand online, but I figured why not try it. Thred Up has never let me down since. Now all of my clothes come from them. This is the best way to buy second hand clothes!
Give Thred Up credit when its due, especially since this is second hand clothing and they have a high volume of clothing to sort through:
The clothes won't be always perfect, so if you don't like second hand clothes then don't buy second hand. If something isn't what you thought then send it back and try something else. You can return it with free shipping and get full store credit, it is a very easy process to return with them and when you do you can let them know exactly why you returned it. So if something was wrong then they will now know (they are only human). *All that being said, I have never had a problem with things being damaged or not accurate to the condition description.*
They might miss a detail here or there, but I honestly don't see it happen often despite me being on their site all the time. Just make sure you read full description and *look at the pictures closely!* Sometimes it can be hard to see details of the clothes sometimes, so just canvass the item thoroughly.