Whatever I like when I find it in a charity shop (thrift for US-ians) or flea market.
I don't bother much about brands except that I notice that some are better made than others and sometimes worth paying more for because they won't fall apart so quickly. I have some nice things from River Island, Monsoon, Zara, Mikko, Wallis. Even Primark has a few things worth buying but usually none of it fits me anyway. But I also have dozens of items from labels that no one has ever heard of that appear one day and disappear the next as well as plenty of items branded by the shops that sell them like Kapp Ahl, Cubus, Marks & Spencer.