Where in San Francisco can I find a scrunchable straw sun hat?

I want a straw hat that will provide shade on sunny days (For trips out of foggy San Francisco). I want one of those straw hats (or synthetic, that look like straw?) that are really soft so that you can scrunch them and don’t have to worry about packing the hat into a bag or suitcase (instead of those rigid straw hats that can break or crack). Does anyone know where I can buy on in San Francisco? I want to be able to try it on, so prefer to purchase in a store rather than online.