Look for bras made with a wicking lining, like Coolmax. They'll dry quickly. Much as a love cotton, cotton does not dry quickly. You'll need something made of manmade fibers that dries faster. My regular bras are cotton, but hoping to buy some cool ones for a future trip. As for the those tanks with built in bras-they horrid if your chesty-and I am. Add to that I'm pooh sized and I wear a regular bra all the time at Disney. Did buy a coolmax tank and supplex shorts-they should dry quickly and hopefully that means the undies will too. I have it a little easier, we always stay offsite at condos and houses. That means a washer and dryer to use in the room, makes it much easier.