given that i do almost all my clothing shopping in boston... i'd say there's plenty.
hootenanny, garment district/$-a-pound, plus the various goodwills and salvation armies (including the huge salvation army which is in some town near here which i'm currently blanking on.)
poor little rich girl, and there's a bunch of other clothing stores like it in harvard square -- there's one on arrow street (which also sells antiques, but i've found some very good clothing there) and of course oona's...