You're right Melvin, a lady named Lorie Garland, who went by "PINKy" started pulling an Allis Chalmers Cmgood said:
painted pink around the circuits in the Carolinas, then elsewhere,to promote breast cancer awareness.
She was the first as far as I know, that started using a pink tractor, either pulling or at a show, for this promotion.
I found this video of her in action.
Pink Power Pulling
I heard a few years ago that she sold the C and built another, but since have lost touch, and not sure.