Shoppers in the former category might want to head to Principessa (1323 Abbot Kinney Blvd.) or to Heist (1316-1/2 Abbot Kinney Blvd)., where they'll find high-quality (though expensive) basics and a well-curated collection of casual and evening attire by hip designers such as Isabel Marant, Malene Birger, and Nicholas K.
For those looking for the unique, offbeat, and humble -- cheap sunglasses, for instance -- head to the Venice boardwalk, where you'll find an abundance of beachwear, T-shirts, and inexpensive and interesting import items -- Thai silk pants/skirt combinations, cloth handbags from Pakistan -- that, along with the abundance of people-watching, can easily consume an entire day.