No one even batted an eye at the bluescreen key not affecting the blue shirt 
pic.twitter.com/gozZCKFwwj
Näytä tämä ketju
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I mean, a rectangle roto acting as a mask for your key won't certainly affect the shirt, since it would be constrained in the rectangle. The only thing in the way would be the hands but that can be manageable. I loved the video by the way!
That's the line along which I was thinking, too. The only video editing I do is with a crappy NLE and I have no compositing skills at all, but it seemed a reasonable-enough trick. I also loved the video.