I'm in SoCal and I havent had too many problems here. The exceptions being when I walk out on the Piers out here, it seems either on the way down the pier or the way back there is always a steady breeze blowing so as to flip the apron over. Fortunately the under apron isnt affected and no exposure results. Its still definately something you have to get used to.

Now, the one time I DID have some exposure was when I was working the Queen Mary Highland Games in Long Beach and I was wearing my UK Nightwatch. If you're familiar with them its a very light ripstop material and it flies around rather easily.
Walking across the gangway with a large box balanced on my shoulder taking both hands, I got a strong updraft from between the ship and the dock. Fortunately it was early and so only a few other vendors caught my "Marilyn moment".