Satiny, bias-cut slip dresses were stuck on waifs and superstars all throughout the 90s. This was an extension of the "underwear as outerwear" trend started by Madonna and her bustiers. They often required wearing a body suit underneath to reduce how transparent they were.
They sucked for girls who were anything over a B cup. You couldn't wear a bra with these dresses. We all know duct tape does not make a good bra