It is the Nobody Dancer hat so hereís your cookie Kagami-chan but your going to have to fight Xemnas for it lol
Itís going to be covered in pink ribnit when I dye the fabric.
I doubt this is the case, but there's a really smiley character from Unlimited Saga who has a mask just like that. Looks cool so far!
I first though of Antlion Man from Tales of the Abyss when I saw the thumbnail :x
I have no idea what it could be from, but right now it looks pretty hilarious!
Good luck with it, whatever it is.