By Daniela (AD: websites mentioned)
I've been shopping (nearly) exclusively second-hand for my own wardrobe for over two years, Here are the shops I've used and liked in no particular order:
I've both bought and sold items on their German website, but they operated in a number of European countries. It's essentially like a big flea-market and I have always felt like a part of a big community. You buy clothes directly from their previous owners and can ask questions, haggle a bit (if you're inclined that way) and buy parcels to save on shipping. They have a buyer protection scheme too, but it is all private sales so you can't return the items (usually).
This is a German only shop (I think, though they sell through ebay too). Here you buy from a re-seller, so they do have a returns-policy. They have a wide variety of clothes and brands, so it is always worth a look.
The Classic! Your place for second-hand designer pieces. Prices can seem a bit steep, but they edit the pieces on offer too, so that you can be sure you're getting a proper designer item and not a knock-off. I've sold items here too and the service is great.
Here are some shops I've found and keep monitoring, but haven't bought anything from yet.
An alternative to VC, it also specialises in designer and high-end clothes. I sometimes compare prices between them and VC when I am looking for something in particular.
A small selection of beautifully curated vintage pieces. The owner used to work in fashion and it shows. You can find some truly stunning and unique pieces at affordable prices. I have been lusting over quite a few pieces on here, but haven't found that one in my size.
Which sites do you frequent?