I have noticed in old movies - 40s, 50s, even 60s - that men's bathing suits are quite brief by today's standards, actually more resembling briefs rather than the modern day trunks.
Standards do come and go but the era of the long baggy shorts seems to be out, especially among the younger men. Shorts are breaking above knee, some very much so. My neighbor's son across the street, having returned home from first year of college, has been seen wearing very short white shorts, and he has the body for it.