What is a bathing suit and why is it so called?

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Basically it is swimming wear. Why is it also called bathing suit? Here is an article to explain:
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The garments we wear when swimming in pools, the ocean, or other bodies of water are commonly known as “bathing suits”, but why? Where did this name originate? The simple answer to that question is that “bathing” suits are named for the English spa city Bath, but since this is an interesting question let’s talk a little bit more about why.
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8 k# _  O9 H0 |4 ?& d8 Q! j$ _; ]% kBath is located in the county of Somerset, in the southeast part of England. It was here at the end of the early modern period (15th through 18th centuries) that people flocked to enjoy the therapeutic waters of the natural thermal springs that England’s Roman conquerors beautified in the first century AD. The elaborate bathing complex and temple built by the Romans in honor of a local water goddess Sulis helped to ensure that the settlement would be remembered even after the Roman facilities fell into disuse and were buried underground in subsequent centuries.
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Under Roman rule, the spa was called “Aquae Sulis” which meant “waters of Sulis”. For obvious reasons, the adoption of Christianity in the British Isles brought about the elimination of “Sulis” from the appellation of this ancient watering place. Over the next several hundred years the name of the settlement evolved due to changes in rulership by different ethnic groups. The name Bath was adopted during the Middle Ages. It is derived from the German word “bad” meaning “bath”, and the Old English term “bæŏ” denoting “the immersion of a body in water”, or “a quantity of water for bathing”.

In the 18th-century fashionable people re-discovered Bath and turned into a resort. Jane Austin writes about the city during this period in its history. Wealthy and well-to-do visitors came to the spa and immersed themselves in its waters to “bathe” attired in what came to be known “bathing costumes”. The words “bath” and “bathe”, based on the place name, eventually grew to be common generic terms, like Kleenex for facial tissue, and Xerox for a photocopy. From this point terms such as “bath salts”, “bathing suit”, and “bath towel” came into being. Initially, they were used only in England but over time became part of the American lexicon.