I own many shirts exactly like that for my contortionism
and, take my word for it, they make your boobs look big.
I think that it's a combination of the skin-tight, synthetic
fabric and the fact that it's white. The fabric has a bit of
a plastic-y sheen to it and everyone knows that white make
things look bigger because it's bright and shadows are
more noticable. Also, that shirt stops pretty high up on her chest.
So I don't think that it's weird that her boobs look
this big considering the circumstances. And I also don't
think that VS has to airbrush Adri's cleavage as much as
they do the other models'.