That group banner photo
Well, that, too, but not necessarily. Those photos came from a large collection that were probably inspired by the Ivy League Nude Photo Scandal (you can look that up on Wikipedia). I think these particular ones are by a photographer named Akira Gomi. He was doing them as early as the mid 1970s. There are photos, clearly in this series, that show dates from that time. This series followed a particular pattern: There would be one full-front, head-to-foot dressed; then there would follow full nudes: full-front head-to-toe, one side head to toe, full back head-to-toe, other side head-to-toe, then front head-to-mid-thigh, and back head-to-mid-thigh.
Looking at the hairstyles, I would guess these are later 90s photos - they're not 80s or before. The hair isn't "big" enough for the fashion of that day. I used to have maybe 100 of these pictures, but never quite sure of their origin