When should I bra shop?

Today I am exactly 4 weeks post TT and BL.
I know I am going to be in the sports bra's for at least 2 more weeks, but am starting to wonder when I can start bra shopping? How will I know when the swelling is truly down enough to be close to "true" size?

Any advice would be appreciated. I am already tired of sports bras - they have never been my favorite. Besides, i want to go get some sexy stuff for summer!

 I waited until the three months the underwire rubbed a little and was not actually comfortable until six months but as far as the size I was good at three months best wishes 

Thank you Maureen.