If you can only shop in one place when you're in L.A., come to Fred Segal. It is an experience you will enjoy. They always have the best, up to date clothing for any occasion, for any style. The Santa Monica store is better than the Melrose store, (although the Melrose one is more popular) and make sure you check out each boutique. You will frequently see stars shopping, so if you want to see some this is a good place to start. I can't afford most of the clothes here but they do have a couple days out of the year when they have huge sales.