White, but you might want to wear an undershirt.
depends on the type of shirt... try a blouse or collared shirt
yes you can wear a white t-shirt under a V-neck shirt, or any colored t-shirt that would match the V-neck shirt. (casual look) or you can wear a button-down shirt with a collar under the V-neck as long as the two shirts match. (more of a dressed-up look)
Yes, it's black.
no
Yes they are worn under either a tshirt or button down shirt some guys leave the buttons unbuttoned and leave the shirt untucked
Fat Albert of the "Cosby Kids" show does not have pillows under his shirt. That's presumably all Albert. I mean, his nickname isn't "Skinny Albert That Wears Pillows Under His Shirt."
They came up with the name under armor by the armor in the T-shirt or sweat shirt,Pants
AG 415 long sleeve shirt or short sleeve shirt.
You go naked under your skirt
Not as a specific rule but it depends on the visibility, most companies these days have a "visible tattoo policy" which is exactly what it says on the tin, if you have tattoos that are visible they need to be covered at all times, one of my colleagues in a bank i worked at had a full set of sleeves but was never allowed to have them showing, he had to wear a long sleeved t-shirt under his work shirt to ensure this.
a black T-shirt
A bra that you can wear under a t-shirt without it being noticed