LA is famous as a city of warm weather, looking good, and being laid-back (i.e., pretending you don't care about looking good). For a brand that's right in that wheelhouse, check out Idol Radec.
From three LA dwellers with wildly divergent backgrounds (industry vet/globetrotting Aussie/guy who's dad was VP of Vans), the Radec look straddles the line between crisp refinement and casual semi-employment. In keeping with SoCal weather, they prominently feature polos and short-sleeve button-ups, fitted enough to accentuate whatever you were able to get done in the gym, but not so tight that they reveal you don't actually belong to a gym. For those not-that-chilly nights, there's the gulf-stream windbreaker, the merino sweater, the v-neck bamboo-blend pullover, or the double-ply gauze cotton cardigan w/ antique brass buttons, available in swimming-pool blue -- camo for those times when you've OD'd in the shallow end, and don't wish to be disturbed.
For those so enthralled with the West Coast lifestyle they refuse to cover their calves, Radec offers reversible board shorts -- because what's more LA than claiming to be something totally new, while actually remaining the exact same thing?