Great Ankle warmers / supports.
 
Ankles are the most important part of a rhythmic gymnastics body. You must keep them warm, so that you can make them strong and flexible, enabling the balances, leaps and turns needed for RG. 
 
Secondly, they protect the skin when practicing ctaches, such as traps with ball and hoop, where the ankles rub on the carpet and get carpet burns. These will ensure the skin stays intact, and any burns you have stay clean.