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I don't think that our Floofy one was talking about "icky" in terms of "not showered". It's a feeling of unwell-annoyance, if people can view you nude without a fitting environment for it.
If I sleep, I'm mostly nude as well - aside from the down sleeping bags which probably need clothing to feel warm enough (sometimes, at minus degrees °C, some of them).
But there's no expectation that anyone would watch me there. How?! My alarm system would tear him apart. ?

Same with showering in my yard / ground, that's my thing. Same goes for bathing in a hot tub or swimming pool. But that's all comparable to "expected nudity": like on nude-allowed beaches, in a swimming hall (showers, dressing rooms), like in sport events (dressing rooms) and so on.
My neighbors wouldn't complain about me being nude, but one side has small children, other side is almost 80 years old. If I would want to sunbath, I would place temporary sight protecting wooden fences and if one of them -specifically- looks around or above.. their problem. But the feeling is less "icky" if I don't
enforce everyone to look at me naked, y'know.
It's neither about feeling ugly (why would I else visit swimming halls or sunbath / shower outside, I have a building with a shower and toilet in it separately), nor about feeling indecent - it's a layer of private sphere which I enjoy. Nothing less, nothing more. And I guess our floofy floofer feels the same in terms of "randomly being nude": that's no problem, but outside not really necessary in most places.
Neither do I go to saunas at the moment, I prefer taking a hot steam bath myself or - in the future - build my own barrel sauna, then it doesn't matter when and how nude I use it. Just not into this enforced near to humans. And that shows as example in such regards: I don't want to have anything "nude" to do with humans, if it isn't environment-related necessary (like showering @ halls).