Since I've decided to base a lot of my character off of Pan and Cernunnos, I decided to do costume design based off of Roman and Celtic clothing and armor.
What I found was that both Celtic and Roman clothing tended to be long and flowing cloth, though Celtic fabric was more intricately patterned, woven textiles. Celtic warriors didn't wear armor early on, but eventually started wearing leather, and an early form of chainmail they invented. Later on they wore metal helmets that resembled Roman helmets, though I don't know which culture drew inspiration from the other.
I have come up with 4 preliminary designs
I wanted the character to feel delicate and ornamental. Their power does not come from physicality, but rather their magic. They laxidaisically and haughtily control their "subjects" with constant heir of superiority.
I think I like designs 2 and 3 the most, with 3 being my favorite. It has a very royal roman feel to it. Let me know what you think!