Women have their style in dressing, even in night-suites that are often quite sexy.
Bikini is another form for them to express with the color, the shape, the type and so on (I am dramatically not expert on bikini types :D )
As women are (in tantric perspective) energy manifestation, they choose the most representing way to make their body shine
Too often in Finland, they think dressing like a Finnish man (who has very little fashion sense) is good ;D
Ahahahahh.
I love the sensuality south American women have as they also spread it onto their dressing