I wear a 38c and have the same style in blue with lace from jcpenny and i got an xl to see if the bra would fit and it did the material was a little stretchy I think your safe to get this if your a c cup. Don't think it would fit a Dcup would Fit though.
Hi! I thought I could maybe help, I have this exact bra lol. From JC penny, and they are "juniors" sizes. I can wear bras in the little girls department I am so flat chested, and I had to buy a medium. So keep that in mind, if you are big. Busted. It will probably fit like a sports bra size large