(Just one thing bothered me though. How could a trumpet player perform with his chest bound as tight as Kay suggests?)

i can't imagine it would be worse than a corset. and i know a couple of trumpet players who during high school did the "vitorian dinner" on full corsetry)

i did it with clarianet. it was so corseted i could barely walk. but you breathe lower for playing. it hurts, but i imagine that after a while you just sort of stop noticing it. especially if it was ONLY his breasts - all of the breathing he needed would be from lower than that.