Kudos to you for keeping physically fit! Not only does it keep you looking fabulous, but it helps a girl feel fabulous as well. As far as workout wear goes, too many girls just toss on an old sweatshirt or tradeshow tee and a pair of ratty shorts figuring, "Hey, I'm gonna sweat anyway so why go to the bother of spiffing up?" I promise you that your workout will be more enjoyable and more productive if you take the time to invest in a few pieces of stylish, supportive and breathable workout wear.
I love the camis with a built in support bra. Stylish, chic and supportive all in one! For those of you with a larger bust, go with a tank style top with thicker straps for extra support. If you are uncomfortable baring that much skin, toss a sleeveless workout shell over the top, or even a great fitted tee shirt - just stay away from big and baggy.
For jazz classes, ballet, yoga etc there are so many stylish separates out there these days! I love yoga pants, because they are sleek and comfortable, and stylish enough to wear while running errands before class! For warmer weather, a pair of sporty crops or capris is great, or even a pair of shorts. You can go with bike-type shorts, or a looser, low-rise style. Just be sure to choose a fabric which allows for good movement and provides aeration and ventilation. I especially love the Champion Double Dry sport soft cotton fabrics which wick and evaporate moisture, while drying quickly. The last thing you want is a soaking wet tee shirt which takes forever to dry.
Be sure your footwear is geared specifically toward your workout. The support structure is different for each shoe, depending on whether you will be using them for walking, jogging, cross-training, dance, etc.