White clothing is a good choice in hot weather because white (or light colors in general) tend to reflect light and heat, while dark colors soak it up.
While it's still ninety degrees plus in southern California, I'm wearing my white! And we may very well be in for eight more weeks of it! I would certainly welcome an early El Nino winter; we desperately need rain and cooler temps.
"Behold! We are not bound forever to the circles of the world, and beyond them is more than memory." J.R.R. Tolkien