The likelihood of needing a spur-of-the-moment costume in New Orleans is inordinately high. Parades don't just happen during Mardi Gra; there's some kind of festival every weekend, not to mention spontaneous theme parties. Le Garage, a low-key nook on lower Decatur, is your friend. Here you'll find a wealth of vintage clothes from all over the world, from military accessories to pirates' swords, and all of it cuts a real dash over pre-packaged costumes. Spend an hour or so browsing and come away with what's bound to be a real conversation piece that costs far less than some mass-produced outfit.