You know who you are—your entire wardrobe is made up of this-season separates (or you wish it were). In either case, you already know about Louis Boston, the big daddy of Boston clothing emporia and a perennial favorite in the category of one-stop shopping. Louis has cornered the local fashion market with its warehouse-size collection of designer labels from Marni and Helmut Lang to Brioni and Loro Piana, not to mention an impressive shoe selection that includes Miu Miu, Tretorn, and everything in between. The makeup counter is equally expansive, stocking such sought-after lines as Pout (sold here exclusively) and Alchemy. With a salon, café, men's department, and new vintage photo gallery, it's a week's worth of shopping under one roof.