Martin Margiela keeps a determinedly low profile for his shop, his label, and for himself. (The Belgian designer is sometimes known as Mr. Secret.) But the clothing has a devoted following for its cut -- sometimes oversize but never bulky -- and for its innovative technique, from spiraling seams to deconstructed shirts. Go upstairs for Ligne 6, his secondary line of more casual (and less expensive) clothes. Menswear is just two doors down. Métro: Palais-Royal. Other location: 23 passage Poitiers, 1, PHONE: 01-40-15-06-44; Métro: Palais-Royal.