I've got a few Primal Wear jerseys Sorry, I have the Tiffany jersey - and sports bra and shorts! Gotta say that it's my most complimented-on ensemble, and my first official jersey purchase. If only I'd know the jersey monster I would become...

But, I digress. Their jerseys have a snug fit. I'm not as 'blessed' as you are, 34B/C on top, size 4 elsewhere, and the small is evenly fitted - not much more room up top. So, I would suggest buying the size that would fit the bustline. Or... get the size that fits the waist, wear it unzipped, and buy the very cute matching sports bra!