I was on T 3 years before i had top surgery but i dont think it makes a difference
T doesnt shrink your chest on its own especially if u are large chested
if u lose a lot of weight (fat) and gain a lot of muscle your breasts might look SLIGHTLY smaller.....but not enough to make a difference
If you are waiting because u think T changes will effect your chest dont hold your breath
Working out, losing weight (fat) and gaining muscle will help you WAYYYY more than T
Also it's taking a risk because while some guys lose weight on T.....there are just as many who GAIN weight on T
Pre-T i was 127 lbs.....Now im 180
I didn't eat anymore than i usually did so it wasnt an appetite issue
T is an anabolic steroid which can cause weight gain easily