I just received a postcard from Swann Galleries; they are having a vintage poster auction on Feb 3 - American, Judaica, Travel, Art Noveau, Art Deco and Ski posters. The postcard featured a couple of vintage men's clothing posters (below). The description reads: "Anonymous, International Tailoring Co., two posters, circa 1920. Estimates $800-$1,200 each." No size information was given. Swann's Website is here, but the catalogue for this auction isn't posted yet - no idea how many clothing posters they have in this auction.