Although I do agree breast are important.
Many TS think women's breast are much bigger than they actually are on average.
Especially, they don't realize that most women with the bigger breasts are overweight
and thus even if they're bigger, they're in fact less defined since the abdomen has fat on it.
The average is 36B in the US (that's for the whole US population old and young).
For the younger population, the average is almost certainly around 34B.
Its becauise the rest of the upper body has no muscles and is thus small that 34B looks much bigger.
TS have a unrealistic assessment of women's breast size. They blame the media. But, if you go on the Mrbreast site, you see that most Hollywood actress is a B cup: 34B is by far the most common size in popular culture icon except a few like angelina Jolie or Brtiney Spear.
Initially, transitioning TS still have this muscle mass which distorts both how much breasts they think they need and the breast they think they have (also, many TS at transition are overweight because they weren't taking care of themselves before (like me) which also distorts breast and band size.
Often, after 6 months, many Trumpet their a B cup, including me, ignoring the fact that if they were at their healthy weight and the pects and back muscles had gone down, both cup and band size would had gone down a lot.
But, its probably better this way, since you get bigger breast quick to balance out the upper body muscles and as they shrink and you get healthier, the breasts with lass fat and underlying muscles follow. In my case, I had a 38B at 6 month, but now have a 34B, which in theory is much smaller, but because I lost upper body (muscles) and adbdomen mass(fat).
When I started, very soon I wore a 38B (and the band was tight so maybe i was a 40A), if I'd stopped there, that would have been quite fine. That's not that small of a band size and its not that big a breasts, yet I was enough for me to pass well. Yet, I hear all the time people TS of this frame (close to 40) that they need C and more breasts to feel like their part of the gang (paraphrased). I don't get it! who do they want to emulate, the average women or the playboy channel bunny?