our autumn/fall season is right now and the summer clearance sales are pretty much over. There are a lot of casual clothing and surfer inspired shops throughout So Cal, though. Pac Sun, Aeropostle, American Apparel, American Eagle Outfitters, Hollister, etc. These stores and shops with similar clothing should be available in malls and specialty shopping areas. Also the closer you get to a beach community like Malibu the more likely you are to find summer-y clothing.