Manzier? Custom bras can be made for men. Check with doctor or google it to find who makes them for women. You may wish to consider surgery (yes, I'm a surgeon) however which can be very effective.
Why? If a man feels he is large enough to need a bra then he should buy a bra in a manly color. Under armor makes elastic shirts that help conceal breast size.
Custom Bra. The seinfeld episode made a point of this. However, custom bras can be purchased in most areas.