The boob window was iconic for her attitude and cockiness since she could use it to clobber her foes and get information when she wanted it. I guess DC wanted the focus to be on her character and not her well proportioned attributes.....idiots!!
Her body shrank
One of PeeGee's charms is that as busty as she was, she was an aggressive fighter, and treated her looks as no big thing. The boob window was just icing on the cake.
Boob window, hell yes!!! very nice btw.