Undershirts still rebellious?

[Quetzal]

Depends. In your case and probably most of the fellow male Loungers, absolutely, as nobody expects us to romp around in our underwear! Now, if you wear T-shirts all the time, including "undershirts" as T-shirts, then you're not being rebelliously; you're just sloppy. A T-shirt (the old definition as an undershirt) can look rebellious when worn with just slacks and leather shoes, which is why this look was highly frowned upon in the 1950s and the 1960s, of course leading to the T-shirt that we know today. To answer your question, yes, if you don't normally wear your "T" in this manner.

-Quetzal