In character creator, gloves already have a left glove and right glove option but there is no left/right option for arms/legs/ears/wings/boots etc. For people that care about separating left/right sides on their costume, there could be a left/right toggle option for the whole of the costume customiser to give people the option of simplifying their options.
This feature would grow customisation options drastically. I say this completely unknowing how difficult it would be to code but if possible, it would have a big impact to costume originality potential.