Protective Leg Guard

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Fed game last night one of the girls had a "shin guard" she wore on her leg during her at bat to protect her from foul balls. I checked through the book this morning and found nothing preventing this. In fact I think we've seen it quite often in baseball.

The problem with this shin guard was it had a replica of a softball on it. It was optic yellow, exactly the same size as the ball we were playing with. I thought there used to be a rule against having anything resembling the ball on your uniform, but after checking the FED book, I can't seem to find it.

Any help here?