Often their female protagonists dressed much more modestly than they were portrayed in the cover art. In fact, Eona is shown in painted on clothing in the cover art on the Utube advert. Men, like Boris Vallejo, tended to portray women as weak, mostly undressed, and and always at the feet of their male heros. Sometimes the cover are sorta reflected the story, and sometimes it did not.

Fantasy writers like Tanith Lee usually had cover art that portrayed more clothed women, and they were usually the protagonists of the story as well. Even "Don't Bite The Sun" and "Drinking Saphire Wine", which featured perpetual teenagers shifting bodies and gender almost at will as they tried to mature in a truly strange technology had good cover art. Her "Birthgrave" featured a near immortal female protagonist that was depicted as dressed in a robe, though the sequels ("Vazkor, son of Vazkor" and "Search for the White Witch") reverted to the Vallejo style covers, mostly undressed female depictions. So it varies. Also variable is the cover art for the various editions, with the ones from the '60s and '70s often featuring the more Vallejo style. I always thought it was to appeal to young males, but I have been told that the primary purchasers were female since they were often essentially books about strong female characters.

In many stories woman are depicted as wearing very skimp chainmale with metal cup bras.

Read "Chicks in Chainmail" and its sequels. There is even a transgendered swordswoman in one of the stories.

She's the mistress/lover to the emperor and she's what they refer to as a "mirage" and a great character that has character too. I was very impressed with the first book anyway. there's a strong resemblance to her story and Pierce's Lioness stories.