The Legion of Superheroes really led the way for coming up with quite a number of powerful, equal female characters in the comics of the 1960s and 70s. No other superteam of that era even came close.
(by the way, the irony of this cover is that less than a year later, Supergirl WOULD kick the Legion of Superheroes out of Adventure Comics and take over a starring role until she finally got her first solo title in 1972.)
They also gave super skimpy outfits to everyone, male and female alike. Cosmic Boy had a very interesting one for a...