Summarize:

Depending on your own body image and personal style, you may prefer workout clothing that is loose, and covers most of your body. Or, you might want to wear fitted outfits that allow you to see your muscles and curves as you exercise. If you are running or biking, do not wear long pants that might cause you to trip or get stuck in the pedals. For yoga and Pilates practitioners, avoid clothing that will not move with you during different poses. Women should look for a good sports bra that offers support and flexibility, and men will want to look for a protective cup if they are playing contact sports as part of their workouts.
Pay attention to fit. Tailor your attire to the specific activity. Incorporate supportive undergarments into your workout wardrobe.