Marketing tips are fashion bast friends.
Keep your clothes loose. The looser, the better. The less fabric you have actually touching your body, the cooler you will be. Believe it or not, a loose and and flowing maxi dress will keep you cooler than a pair of shorts and a skintight tank.
Make sure your clothes are as fresh and clean as you are. Rewearing your clothes between washes is a great way to avoid doing laundry, but even light wear leaves dirt, sweat, skin cells, and cosmetics trapped in the fibers of your clothes, which makes them less breathable and you hotter.