About the design: The material is elastic, breathable and lightweight to allow for maximum range of movement and speed. The base of his outfit is a leotard (he doesn't like to wear pants because they restrict his movements — he's stupidly flexible). It has a self-cleaning property which is helpful when adventuring.
The belt can be used to clip sachets, weapons or extra stuff onto when adventuring. Most of the time, it's for aesthetic reasons.
The flower in his hair is called an 'Eternal Bloom'; flowers that are often synonymous with purity and light. He wears one because they were his mother's favourite flowers, he also just likes to have one on him whenever possible.
——————————————————————————————————————————- Let me know what you think and if there's anything I can do to improve.