Well considering my family always goes in August when it's 100 degrees and hot and sticky, we wear as little clothes as possible. For my mom, my sister and I, it's always shorts and a tank top. And for my dad and the boyfriends it's shorts and a lightweight t-shirt. Then of course everyone wears socks and sneakers because they're the most comfortable to walk around in. I always bring a pair of capris and a very lightweight jacket just in case, but of course I never need them.
My sister and I are planning on going in January next year, so it's going to be weird trying to figure out what to bring to wear!