Loose-fitting gear may be the best choice if you are starting an exercise program and your body is not yet toned, or if you feel self-conscious about parts of your body that are larger than you'd like them to be. But some tighter-fitting gear can still be flattering. Want to minimize upper arm flab? Choose a stretchy top with tight, elbow-length sleeves. Want to minimize heavy thighs? Choose tight, stretchy knee-length shorts.
Of course, you'll want to wear gear that's appropriate for the type of workout you are involved in. And you'll want to wear a bra that holds you in place--a sports bra, perhaps.
The most important consideration is to wear clothing that is comfortable--both physically and psychologically. That outfit with the fitted, stretchy fabric may stretch where you need it to stretch when you're working out, but if the way it hugs you makes you feel self-conscious, your concentration and workout will suffer.
Whatever fitness clothing you choose, make sure the fabric moves with your movements, does not chafe your skin and wicks away perspiration.
With everyone from discount stores to designer houses offering fitness clothing from petite to plus sizes, there is sure to be a fitness fashion in a price range and style that is right for you.