If the OP is searching for men's fashions, ModCloth won't be much help. (Although it can be a great help if the OP is looking for affordable women's dapper wear.) The suggestion to try a Google image search is a good one -- often that can be a great place to start. At least you can learn the terminology for what you want. The Dapper Days site has links to sites that sell vintage/vintage style clothing. Swing dance sites sometimes have links to clothing stores.