DO: Ascots. Just kidding. But don't be afraid to punch up your outfits with a little something extra, whether that's a pair of sunglasses, a hat, a watch, a pocket square, a knit tie ... look at David Gandy up there. Just remember to keep it simple.*
DON'T: Do puka shell necklaces and arm parties.
*This should really be the final tip, because accessories should be the last thing you put on ... but they're not called z'accessories.