Going to Philly - you got to check out Me and Blue Boutique. This second floor store has a great stash of vintage finds such as hats, jewelry, belts, purses.
It is also a studio where the owners design there own creations which have an avant garde flair. They also carry a bunch of other designers, known and unknowns, but it doesn't matter who its made from because the buyer ensures that the selection is fabulous. Always one of each kind so if you see it and you like it you better grab it. I bought a dress that that I couldn't stop touching and it came home with me and its my favorite garb in my overstuffed closet.
Staff is super friendly and cool to chat with. They have great style and whether they are hip to the trends or choose not to follow - they are still hip as can be in all of Philly.