On the beach, why not? I did, in what was considered ‘too brief’ when I was young.
I agree about a cover up in shops though. There are some lovely ones on Shein. When I watch how often girls adjust their bikini bottoms, I’d rather they didn’t touch the items I’m buying.
It’s not just those girls you mention who need to cover up.
I’d still rather see girls in the clothing you describe than some of the sights you can see on any beach.
To think that London, or anywhere else for that matter, does not belong to any one demographic