Please note, none of my costumes are hand-made or designed. I've merely pieced together articles that seem to kinda match. The Phoenix costume is one piece and was merely bought on ebay. Same with the Snake-eyes mask. It was a bought prop. (I don't want to take credit for something that I didn't do!)
Trust me, I WISH I had the talent for actually making this stuff! Alas, I don't, but I do love the wearing of it!

Jean Grey - Dark Phoenix(X-men)

Scarlett (G.I. Joe)

Snake Eyes (G.I.Joe)

(Cosplayer: Kevin)
Comic Book Reference for Costume - Devil's Due "Reborn" issue 1

Still working on: