Not designed for real breasts.
"I really really wanted this to fit. The design is beautiful, and I love the look. But it’s not build for someone with any breasts. Mine aren’t huge by any means, but it’s like they had nowhere to go except over the top! And the band around the chests was very loose… so, I couldn’t even go for a larger size to get the fit right. Wouldn’t bother unless you have no chest."