3.1 Phillip Lim

The designer behind this overwhelmingly successful collection was 31 when he first started his line in 2005; now he can boast three gorgeous stand-alone boutiques. The Los Angeles shop was the third to open (there are others in New York and Tokyo), but it's arguably the best-looking, with painted foam walls and cool slate floors. An understated elegance is the abiding theme behind the clothes too, from lace-edged camisoles to pintucked blouses. There are also pieces from the organic Go Green Go collection.
631 N. Robertson Blvd., 310-289-0888, 31philliplim.com