I love this bra! I initially purchased a medium and a small, because of my smaller ribcage, and I was uncertain which would fit well. Though the website says to match your T-shirt size, I found that to be inaccurate. I normally wear a large T-shirt and after trying the two sizes, I settled on the small to be the best fit for running. The medium was comfortable, but didn’t give the firm support that the small offered. I now have 6 of these bras because I needed to be able to wear one every day! L...