Also interesting, mentioned in this article but not fully explained are Bathing Machines. https://en.wikipedia.org/wiki/Bathing_machine
Essentially a carriage that sat in the water that you changed clothes in, sometime is to a provider outfit.
You climb in on one side on the beach and out the other into the water.
Amazing that social etiquette was so strong nobody asked "hey why don't we go right into the water?"