According to Rupert and Lichfields' piece in The Independent garments resembling the bikini date back to 4500 BC; however, they were worn for active wear and not for swimwear, which was done in the nude.
The modern bikini was introduced in 1946 by Jacques Heim, a French designer, and Louis Réard, an engineer who happened to be managing his mother's lingerie business. Interestingly, Réard hired Micheline Bernardini, a 19-year-old nude dancer, to model his bikini when it was introduced. The press and public were shocked, because it was the first swimwear design that exposed the navel.
According to Time's "Evolution of the Bikini":
Bikinis were banned from worldwide beauty pageants after the first Miss World Contest in London in 1951. As the tasteful one-piece continued to reign supreme, the bikini was later also banned in Belgium, Italy, Spain and Australia, and it was even declared sinful by the Vatican.
However, after the bikini was worn publicly by actresses like 19-year-old Bridget Bardot, who was seen on the cover of popular magazines like Sports Illustrated and featured in blockbusters like James Bond's Dr. No (1962), the bikini became more and more accepted around the Christian world. (14-year-old Bardot had an affair with 22-year-old Roger Vadim, the director of Pretty Maids All in a Row (1971) that was based on Francis Pollini's shocking ephebophilia themed novel.)
Thongs were initially worn as underwear, but by the turn of the century, women started exposing their thongs via low-cut jeans and now they're being worn in public as swimwear - even by nymphets, which may not be surprising, because if they're worn by nymphets they must be sold to nymphets.
In 2002, Abercrombie & Fitch (A&F) started selling thongs for pre-teen nymphets emblazoned with the words "wink wink" and "eye candy". In response to the controversy surrounding the items A&F responded, "The underwear for young girls was created with the intent to be lighthearted and cute. Any misrepresentation of that is purely in the eye of the beholder."
|Abercrombie & Fitch's Pre-Teen Thong|
In an undated post, the Daily Mail reported:
High Street chain Argos has been branded irresponsible for promoting a range of sexually provocative lingerie designed for primary schoolgirls. The underwear, which includes tiny G-string pants and padded bras, is advertised in the store's catalogue for girls aged between nine and 16. The Tammy range, sold for as little as £5 for a pack of four thongs, also includes a 'loveheart' underwear set in pastel pink and thongs with I Love Me emblazoned on the front.
And the Daily Mail reported in 2008:
Parents have condemned Bhs for selling nipple tassels, edible G-strings and breast-shaped stress relievers alongside toys. The retail chain, owned by billionaire Sir Philip Green, insists the raunchy Christmas gifts are 'harmless fun', but it has been accused of sinking to crudity in an attempt to boost sales.
Yet, some parents don't mind that their daughters wear thongs. Kate Strathearn's daughter attended Hamp Junior School in Bridgwater, Somerset. She said in a BBC article, "I have not told my daughter not to wear them and I do not ask her in the morning what she is wearing. She is 11 and she has a good head on her shoulders."
The same way the Bridget Bardot helped to popularize the bikini, nymphets like Katherine Heigl, Bella Thorne and Hailey Baldwin may help spur the rise of nymphets in thongs on beaches all over the Christian world, which may already have happened. If you Google "teen thong" you'll get over five million results, and if you narrow that search to "teen thong beach", you'll get over four million results.