I've tried it myself, making a floating fellow but... there's no invisible feet. Bah.
Forgot about it.
Then recently saw a floating mech... oooo.. waitaminute... pair of feet.
There is a material-by-part + I think black that makes feet invisible; I have it on my ghost. Been out of the game for a while, so I forget the material name.
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And playing by myself since Aug 2009
Godtier: Lifetime Subscriber
Someone on staff has a foot fetish is the reason.
My super cool CC build and how to use it.