Great news, I hope the group continues to be a strong support for you.
Quotenote to self never wear yellow.
I find lighter colours can emphasise the breasts more probably because it makes the shadow underneath more obvious. I'd avoid white and other light colours and stick with dark colours and loose, checked shirts if you want to keep them less visible. Wearing a slightly tighter t-shirt underneath your shirt also helps to a point.
Quotei know it not being transgender because it is the last thing they would expect ( i think)
Yeah, that is usually the last thing most people ever expect - largely because they don't understand anything about how transition and hormones work.