I'm not making this about what's sexual or not sexual.
Women's breasts aren't inherently sexual, especially if they are really old women's breasts, saggy, wrinkled bags of powder. So, even if their breasts aren't sexual or attractive, I think they should still cover themselves up, because it's immodest and not honorable. This isn't entirely about sexuality, we cover up our butts for a reason, not just the front sides, it's about covering what's supposed to be covered, and I believe God puts it in our conscience to cover ourselves up, just like in Genesis.
As for Spain, and Africa, I think they set their own standards, and they don't agree with the top tier of modesty, and I think Christians should aim for that top tier of what's modest or at least aim for what's sufficiently modest, like a tank and trunks on everyone.
Women can wear no socks if they want. I'm saying men should wear shirts. That's my point, and that's what I said in the OP.