I never buy bikini tops. The tops won't enhance what I (don't) have ( If I cannot be topfree, then forget it... I like to wear short silk boxer shorts on the beach or the tan-thru bottoms. I have quite a collection of them. And I am over 50.
Yesterday, it was a nice and sunny day... not extremely warm, but warm enough to go around in a tshirt. I went to the grocery store, and I would say almost 100 % of the women wear bras - but this one ). I did not see anyone that looked natural, but then I was not looking at everyone chest either!!! LOL.