I came up with 36 around and a inch and a half at the fullest. am i a a or b ?

I was between sizes as well. I ordered both sizes. The smaller size fits better. The bigger size still fits, it just seems to be a little too loose by the end of the day.

Could this bra be worn as a halter bra?

Personally, I would not wear it alone. It looks like a nice, lacy bra, not a halter top. Plus, it does show a lot of cleavage depending on your cup size. However, it may work nicely peeking out from under a top, or through a see through shirt.

Yes and non removable. I order 32A and it fits perfect.

Being transgender and new to this , you girls have any suggestions for dealing with the underwire digging in ?

Wireless bras lol … that’s the only thing I can think of but since I’ve been wearing this type I haven’t had that problem much. Go get professional sized that might be the problem