The B&W photo is Susan Saint James at the Kennedy Compound in Hyannis, Massachusetts; August 21, 1981; photo by Ron Galella.
According to the interwebs:
I saw the Saint James nip slip on The Tonight Show, June 28, 1978. (s16e184) Host John Davidson mentioned it. The actress then pulled the other side of her dress to expose her other nipple and said, “There’s one on this side too.” The camera switched as she began to expose herself so only the audio was in evidence. You gotta love the old time live airings.
The nip-slip may be real, but there is something wrong with that photo. It seems that she is supposed to be looking at something between her hands, but there is nothing there. Yet it seems to cast a shadow.
Unfortunately, that episode of The Tonight Show is not available for a fact-check.

I remember her. She did commentary with MEEKMAHAN at the New York portion of WrestleMania 2 where she mainly said “uh-oh” throughout the entire portion of that show. Terrible WrestleMania.
Maybe try “Love at First Bite: with George Hamilton.
Nope….that is reputed to have happened on the Carson show.when John Davidson was hosting and she was doing publicity for “Love at First Bite.” Note there are no videos available online for that episode. Celebrity Sleuth is reported to have run that pic.
Yep, it’s on page 32 of the first ever “Celebrity Sleuth” mag from 1985, saying it’s from the Tonight show, along with a little see-thru swimsuit shot from “Battle of the Network Stars”
Check out how casually a Dutch TV presenter appears at an award show:
Interesting, though she has some weird Z-shaped thing where her bush should be.
The first pic is from the Johnny Carson show. You can see the couch behind her.