Cat and her Towel ???

[slowballbaker]

I have been watching Cat pitch, and she is good..And it looks as if she is illegal....But enough about the leaping,
what about the towel behind her back....
Umpires question....

Why aren't the opposing batters complaining about the towel... If they ask the plate umpire that it is a destraction and is a destraction at the release point, should the umpire have it removed????
It is of course not part of her uniform...

What is the rule and will a team challenge the towel???

Thanks