I was confused, just at first, as to why they would all be wearing think black garters so high up on their thighs.

yeah, I don't get the choice of color on the shorts myself. It's the oddest side story in the movie in my opinion.
For those that haven't seen it, Marilyn Monroe and Jane Russell get on a boat to look for wealthy bachelors to woo. Jane wants to flirt with the entire Olympic Mens Gymnastics Team who are not allowed to date while training.
Yeah, that's the reason they're not interested in the incredibly hot chick who's singing during their training. Sure it is.

I figured that way you could find the other Jane Russell clip, but then again, you can use the "Jane Russell" tag for that I guess.