Original clothes

I'm looking for clothes that are bit different, good quality, elegant certainly, but not too expensive. Highstreet shops are very laddish, and charity shops just aren't what they used to be in terms of finding gems, so my wardrobe is slowly stagnating. Last time I went into London, I followed the advice of a friend and took a trip to Portabello, but saw nothing inspiring - just tired looking 60's and 70's rhetro. Does anyone have any recommendations? Are there any good period clothes shops or sartotial-art clothes shops, off or online that you could tell me about??