Bikini vs underwear?

abc--123
On the beach, by a pool and around holiday destinations it is perfectly acceptable to wear a binkini all day walking around. All a bikini consists of is a bra and panties so it is basically underwear made from different material.

So by this logic why is it socially acceptable to walk around in a bikini but not underwear?

Also if it was socially acceptable would you walk around in your underwear?
Bikini vs underwear?
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