Well. I have lived in Greece for many years and it's completely natural for men and women to walk around in their bathing gear, or just a little towel thingy (shawl maybe) around their wast. In Canada (where I also lived), it's much less common (combination of colder weather, lack of beaches and history of Catholicism and a slightly more conservative society).
Anyhow, in Greece, people still stare if they want to. The difference is that they don't blame the women for dressing like that, or of being whores. They don't say, well she was asking for it. And groping is not acceptable. On the other hand, in conservative societies it's not the norm that women go out like that, so if they do they are called names and/or get groped. Perhaps they might even defend themselves to the police by saying, well she was dressed like that. That does not prove anything though. I'm sure we can all see how ridiculous that is.
If you go to Greece for even one month (try July if possible) it might occur to you that less clothing is more comfortable, for men as well as women. At first you may be surprised to see the 80 year old grannies walking around in a bikini, or old men walking around with their saggy bellies, moobs, and hairy chests exposed, but eventually you will get used to it. I think, the same might happen in Korea if you stay a while (maybe try to go to a Jinjilbang a few times...)