I'm in the same boat, and it's getting really warm here really fast. Cooler today, but it was like 70 on Wed. and I was burning up in my baggy longsleeve shirt.
I was thinking I'd try to find some more andro clothes (especially shirts) and that might make it somehow...less awkward or something when people notice the boobs? The problem is figuring out what a more androgynous shirt would be. The only thing I can come up with are those shirts some male rockers wore in the 60s/70s, a peasant shirt? Can't seem to find any that aren't way too feminine though.
I could just come out socially and transition, but I'm honestly not ready for that. Too much change in my life otherwise that I'm still adapting to. I thought I'd have more time on low-dose. Oh well, guess it had to happen sooner or later. Was hoping for a more feminized face and a somewhat calmer life before the boobs showed up though.
Good luck to you!