Wouldn’t a busty beach be better than a busy beach?
Biological reality check: breasts exposed to the sun for extended periods don’t keep their taut & perky look for very long.
One bad sunburn up top and a woman is instantly middle aged.
So there is pragmatic reason to keep the female bosom covered when outdoors which has little to do with religious or societal concerns. Them’s the facts.
A busy, busty beach is best.