I recently purchased my first binder and I am in love with it! However, when I tried it on I was a little disappointed. I wore the binder and a t-shirt over it, since that's what I'll be wearing out. It concealed my breasts somewhat but I could still see them. I am a D-cup, so my boobs are somewhat large. Is there any way I can minimize them more? Keep in mind that it's summer and I live in a state where temperatures easily reach over 100 degrees each day, so I don't want to overheat.

Thanks!