(Adding to this) My sense is that for thin trans women you will almost certainly not end up with seriously inconveniently-sized breasts unless you get implants. It's not a guarantee as I do know trans women with pretty huge bazonkas but it's certainly a strong tendency.

Before I transitioned I was non-overweight and had moderate gynecomastia. It never posed any problems for my ability to present as male or to be attractive to straight women.

if this is for zoomers you need to use the cheery tiktok lady voice. shes hypnotic.