Always one to go a bit against the grain, my usual casual footwear hasn't been mentioned yet. Ladies and Gentlemen, I give you........
The Huarache!
But.... only the handmade ones with real 40k tire tread as a sole. Get them wet (preferably salt water) walk a bit until they dry and they are like a fine pair of Italian loafers. I also wear Keens when fishing or hiking (for toe protection) and flip flops just to mix it up.
Also, growing up we also called flip flops "go aheads" or "zories".