[The First Aria]

I have just bought from amazon and I buy sports bras for now. I have bought a few regular and often they don't fir right. I have heard cis women complain about the same issue. Seems like you need to try them on and the sizing is all over the place.

I am not sure what size you are but I was thinking of an order from this place sometime:

https://www.wearpepper.com/

Unfortunately Kay, you are right about the sizing.  But especially true for Transgender women and even athletic cis.  What works for me is to measure the band size just below the armpits.  It gets you closer to correct size.  As for cup size, it varies quite a bit from style, composition etc. .  Heck, that is true even if you still to the same brand as well.

It drives a person mad/crazy trying to navigate online buying.

Aria