The Wiki link describes the early days of the bikini- I cannot imagine that sales (in the USA) were anything spectacular , in the late 1940’s. I would imagine their acceptance would be limited, until the mid-60’s (sexuqal revolution).
Interestingly, the first girls to wear bikinis at Copacabana Beach (Rio de Janeiro, Brazil), were asked to leave-they were felt to be too provocative. Today, the style worn in Brazil (tanga) is almost non-existent-probably a few square inches of material.
Bikinis were common in the U.S. throughout the 50s. They were in a multitude of different styles and levels of coverage, but the sexual revolution had little to do with swimwear.
From the movie Stand by Me:
TEDDY: Have you guys been watching the Mickey Mouse Club lately?
GORDIE, CHRIS AND VERN: Yeah.
TEDDY: I think Annette’s tits are getting bigger.
CHRIS: Think so?
TEDDY: Yeah, I think so.
GORDIE: Yeah. I think he’s right. I’ve been noticing lately that the A and the E are beginning to bend around the sides.
VERN: Annette’s tits are great!
GORDIE, CHRIS AND TEDDY: Yeah.
Back in the day, we called them all Bermudas.
You win the intraweb.