Where "Bathers" Comes From
"Bathers" is a shortened form of "bathing costume" — the Victorian-era British term for swimwear. As British settlers brought the expression to Australia, different colonies ran with different parts of it: New South Wales kept "costume" and shortened it to "cossie," while Victoria, South Australia, Western Australia, and Tasmania ran with "bathing" and eventually arrived at "bathers." This split reflects the broader pattern in Australian English where competing British regional dialects settled differently in different colonies.
The term became firmly established during the late 19th and early 20th century as public sea bathing became both popular and legally regulated. The 1907 Sydney bathing costume protests — in which bathers were fined and demonstrators contested full-body coverage laws — put swimwear in the headlines and cemented the vocabulary. Today "bathers" marks a speaker as likely from Victoria or South Australia, while "cossie" points to NSW and "togs" to Queensland — a living map of colonial language diversity.
Source:
"Where'd I put me bathers?"
How Aussies Actually Use It
A regional marker as much as a slang word — hearing someone say "bathers" instead of "cossie" or "swimmers" is often a giveaway they're from Victoria or SA.
It's used exactly like "swimsuit" would be elsewhere: "where'd I put me bathers?" before a trip to the pool or beach.
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