Many years ago I watched a random tape that I just grabbed off the shelf at Blockbuster from the Japanese Animation section. I was very young so I don't remember much about it except that the mech was piloted by a nude female hooked up to lots of electrodes. I also believe there was some sort of alien invasion of the earth going on. I think she had blue hair and was being instructed in using the mech by a blonde haired woman. I remember her being rather unwilling to pilot the mech at first.
If it helps, I think some of the aliens that were attacking would latch themselves onto people's heads and take control of their bodies. However, the invaders that were in command seemed humanoid and had their own mech and pilot who was also female and piloted the mech while nude.
I appreciate any help that can be provided, thanks!