Quote from tinyk :

Doesn't work. I see people using team skins that clearly have member names on them. They don't care. I give them 1 option remove it or be banned from all of our servers. I don't care what team skin it is. If it's not theirs don't wear it.

~*~*~*~tinyk~*~*~*~

The above seems like the best solution of all.
Keep it simple, treat skinstealers in the same way you treat wreckers