I normally buy clothes about 50:50 new and from charity shops, and since the first lockdown I've started buying on ebay to replace the charity shops.
I don't know if I expect too much. If something is used I obviously expect it to have some signs of wear, but not to be stained, torn etc.
Today I received a dress with a biro mark on the back, last week I was sent a skirt with two shiny iron marks on it. I've just looked and I've bought 19 items in total, and 4 have had to go back 
I live rurally about 20 mins drive to the post office, and although sellers have accepted items back, it's still a pia for me.
I'm wondering if I should just give up altogether ..... The one thing all 4 have in common is that they were being sold by sellers who are selling 100s of items at a time, so I wonder how carefully things get checked? Or maybe I have just been unlucky do far and should persevere?