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It is hard to reconcile the fact that it's so easy to get enough D from sun in a short time with the fact that deficiency levels are roughly 40% in the US, with insufficiency (20-30ng/ml) much, much higher than 40% (and also high is much of the rest of the world). Look at the world chart in the paper (copied from Palacios et al review): 73% insufficiency in Austrelia, 61% in Britain even in summer, etc.).

Clothed? Naked? In shorts?

That's not even wrong when you haven't specified anglenpf sun (latitude or time of day.)

Tell it to every derm I’ve talked to or read.

It might be good to exercise a bit of common sense before believing everything a doctor tells you.

How likely is it that getting even small amounts of sunlight is horribly dangerous? Do you believe in evolution? (For that matter, if you instead believe in creation by a benevolent god, you get the same answer.)