They sound like they would go together to me. Especially if they're all nice and blended. And it's not like the sweat really goes away when you wash your clothes. It's just replaced with a different sort of water long enough to make them not stink.
And it's more natural than regular dyes. I'm also super, super curious if it'll work.
Fuck. Now, I want to arrange a tie-dye party for everyone affected.