Yes, a fashionable high viz coat.
You could use a standard colour like green or blue that's not fluorescent, but you could make cool patterns with the reflective stuff.
If someone made one, at a sensible price, I'd have it.
Even the right pattern with the reflective stuff might be cool with fluoro yellow. What about a jacket that's yellow, with the patterns from a wasp on the back of it?
Oh, and it has to be properly waterproof. Those are the key things!