Quote Originally Posted by colorisnt View Post
I'm a 34 DD and I end up just opting for the "eff it" and wearing a bra strategy. You will sometimes find me with my jersey zipped down past my boobs on a hot day where I am sweating a lot. I just don't care. And if anyone does, they've never voiced any appearances. Yeah, I have boobs. I'm a lady. It happens.

I do understand why that may not work for you, though. I second the ask them if they could buy you something else strategy. I love LG jerseys because they are very breathable. Sugoi also makes some. Neither brand is very see-through. I can wear whatever, basically. But I'm already in spandex. My version of modesty is basically, "I'm sweating a lot and working hard, so if someone is offended by that, I will be gone in 30 seconds and they can get over it".
I'm not well-endowed but I also tend to unzip the jersey pretty far on a hot day. I do try to remember to zip it back up if I stop anywhere. I once went into a park visitor center, not realizing how unzipped my jersey was, and the poor ranger who tried to answer the questions I asked him had to try very hard to be polite and maintain eye contact with me.

You could try to find a sports bra that is similar to your skin tone to make it less noticeable under the jersey.