What I find maddening, is that you can buy a bra, lets say a 38b that fits great. Not too tight on the breast's, but snug that also feels fine in the band. BUT, in the same brand just go to a different color, or slightly different in material or style and it's just too tight everywhere.
I have ran into that quite a few times. I probably have at least 5 bra's that I can not wear yet, or am way past that particular one due to growth.
I think bio females may have the same problem, but not to the same extent.