Is 28aaa bra size really flat chested or no?

AAA is the smallest bra cup size you can get. There are not many manufacturers that offer this size bra. But you can still find them if you try hard enough. The smallest band size you can get for this cup is 28 and the biggest band size is 42.

I love small perky nipples breast very sexy!

not at all in my opinion

my wife's nipple is a 28 aaa.   are you asking if 28aaa is a boob size

28 is the band size, which is your chest under the breasts...... AAA doesn't exist.

A pirate's dream, a sunken chest.

The number part of a bra size refers to the measurement around your body just under the breasts, so that is about how slim you are, not the size of your breasts.

But the letter part of a bra size does refer to the size of your breasts, with A being small, B & C average and D and up large. A size lower than A is AA, and lower still, AAA. So yes, that would be flat chested.

Not flat. "aaa" if it really existed, would be concave.

I didn't even know there was a triple A. I'm afraid I would say so, yes. Even a cis man might find that too small.