Lots of the consignment stores on Palm Beach have Chanel, Hermes, LV, etc. I'd recommend also Fashionista Palm Beach and Consigned Couture in North Palm Beach has a lot of LVs and Chanels as well. The Goodwill on the Island has lots of fakes so beware. Fashionista Palm Beach has a TON of luxury clothes. They have a rack for Hermes, Escada, etc. They also have Birkins and a whole cabinet devoted to Chanel accessories.
City Girl Consignment on Dixie Highway in West Palm has lots of Manolos and
Prada and
Gucci and
Coach. Sometimes they get a Chanel here and there and LV. Fashionista also has a store on Dixie Highway a bit further south (like 5 min bike ride) and they have cheaper items than the Palm Beach store. Theres a lot of consignment stores on this street by the downtown and its also known as "antique row" for all the expensive antique stores.