Those going for a swim in the sea at the beach would use a bathing machine.
From the en.wikipedia.org
In 1768 a Mr Capon, emulating Brighton, introduced the first bathing machine to Lowestoft.
From the edp24.co.uk
In the Victorian era, the bathing machine was developed.
From the en.wikipedia.org
For example, despite the use of the bathing machine, it was still possible to see people bathing nude.
From the en.wikipedia.org
The bathing machine was part of sea-bathing etiquette that was more rigorously enforced upon women than men.
From the en.wikipedia.org
The queen's bathing machine was unusually ornate, with a front verandah and curtains which would conceal her until she had entered the water.
From the independent.co.uk
In subsequent years, the bathing machine was used as a hen coop, and much damage was done to the beach when it was used for army training during the Second World War.