In fashion, one day you're in but the next you might be out. That's the concept behind Comme des Garçons' string of pop-up stores, which have finally come to Paris after making a splash around the world in cities like Singapore and Warsaw. Two Comme des Garçons Pocket stores, one in the Marais (31 rue Debelleyme, 3rd. M° Filles du Calvaire) and one in Montmartre (17 rue La Vieuville, 18th. M° Abbesses. 01.42.72.15.12), have just opened and sell selected items from the fragrance, accessory and CdG PLAY streetwear lines. The storefronts are tiny and spare, tucked into non-descript side streets away from other major boutiques. JM