Obviously the most blatant problem with Ingvard's redesigns that they were all designed by the same guy and they totally look it without much regard for who the characters are. Power Girl and Supergirl aren't going to be any more protected from damage because they have less skin showing and Supergirl's cheerleader outfit is no more unreasonable than Superman's painted-on circus outfit. The only real practicality issue with Power Girl and Supergirl is that cleavage wouldn't work with flying fast in atmosphere. Bare arms, bare legs, who cares? That's prudery, not practicality.
That being said there are things that I really like, like the idea of Wonder Woman with her hair in a braid, Elektra's pull-down mask, Sonja's armour (which is more or less what REH's Sonya actually wore). In fact Elektra and Black Canary work for me because he really seems to be designing street level outfits for everyone.