You guessed it, you can't use them.

Anything derived from a copyrighted mesh, no matter how changed, is still technically part of that mesh. Otherwise, everyone and their dog would be making and selling/giving away bodysuits/masks/cowls/skullcaps etc for every figure ever made by doing essentially the same as you did. In fact, that's pretty much how a bodysuit is made anyhow. In fact, it would be the quickest and simplest way to make almost any kind of clothing.

I know for a fact there are some masks and stuff out there - not made by the figure owners - derived from the original figure mesh but that doesn't mean it's right to do so; it just means they haven't been found out.

Coppula eam se non posit acceptera jocularum.

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