dlblue:

Concerning second skins, if the nipple shows like in a tee shirt with no bra, Nude or not? if so nude, WHY? men have nipples that they aren't required to cover. if there is no clothing covering it, or see through clothing, I can understand this, but painted clothing that shows a shiloette of the nip is a proble? Yes or no.

No, not nudity at all. Here are the rules again:

No nudity in thumbnails. This means no clothes, clothes that are transparent or blurring of nude images.
Tasteful breast exposure only is allowed. No areola or nipple exposure, and no transparent fabric.
No exposed buttocks – more exposure than a standard bikini bottom would constitute nudity.
No exposed male or female genitals
No Sexually Suggestive Language or "Censored" language/images.

So as long as the top isn't sheer, you're fine.
The only problem may be if the top was for some reason flesh-coloured, so that it looked at first glance like the model was nude. That might cause some confusion. But I'd imagine the times you'd use a flesh-coloured outfit would be very few and far between...

Hope this helps :-)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire