I second this. Make it a Christmas he’ll remeber fondly forever!
The Wonder Woman outfit is a great idea!
Supergirl is great too!
(and Halloween costumes are on sale!)
I just keep thinking about when I was much younger. I used to like to dress up my boyfriend like he was Ken doll. Of course, real life clothes are much better than the crap you can get for Ken so it’s much more fun. He liked it because, of course, men have no fashion sense and want women to dress them. 
My best friend’s ex-husband every year would get out all of the clothes that his wife, mother, grandmothers, sisters, mother-in-law, and sisters-in-law had gotten him and parade them around. He was very proud of the fact that for the next year he would have clothes to wear that women had bought for him. (I miss that about him, but don’t tell my best friend.)
2 words: oral sex.