According to the tape measure, I'm a 42 C by whatever means made it happen. I've mentioned on other threads, I lost 50 pounds and they were what was left, gynecomastia, magic, who knows, who cares.
The fact that I wear a 38 B bra and it fits and is comfortable makes me wonder about this whole bra sizing mystery thing...
Anyway, to your question. I don't present as female really anywhere but in my apartment and that's mostly in my mind regardless of what I'm wearing. Just the way it is. Terminal Man in a Dress...
When I'm out and about, I just do what I do. Most days, I wear men's button up shirts and nobody notices. My boobs are always obvious to me, but I'm self conscious, aren't' we all?
When I exercise, walk, ride my bike, that kind of stuff, I wear a t-shirt and a sport bra. For the pool, I usually wear a t-shirt, but that has more to do with overexposure to the sun than modesty. The times I've not worn a t-shirt, nobody said a word.
I guess boobs on a 64 year old guy aren't that uncommon...