Shirts. Generally, Women wears T-shirts, tank tops, long-sleeved shirts and sweatshirts during their gym workout. It's wise, yet, to check your gym's dress code to ensure what shirts are appropriate. In general, while workout in a gym, permit tank tops but frown on halter tops and shirts that show excessive cleavage. Decathlon provides best quality fitness outfits for women which will feel quite a relaxation during the workout. If you are interested to buy these amazing outfits at a very cheap price go through a. I also purchased some T-shirts and tank tops for a gym and it was so cool and helps to do a workout.