From my experience, when choosing gymnastics clothing, the key is to prioritize comfort and flexibility. The material should be stretchy enough to allow for a full range of motion without constraining movements. I'd recommend leotards or unitards made of a blend of spandex or Lycra with cotton or polyester. Also, make sure the seams are flat to prevent any chafing during routines. And don't forget to consider the aesthetics too! A beautiful design can boost confidence and make your performance even more memorable.