How Long After I Stop Breastfeeding Can I Buy New Bras?

I have stopped breastfeeding and my breasts NEVER feel full or anything anymore but none of my pre-pregnancy bras fit. I don’t want to waste a bunch of money if by breasts will shrink back to their original size and my nursing bras are too big. When did you buy new bras? How long did it take until you had your “regular size” boobs?

As A Breastfeeding Mom, At What Point Can You Start To Wear Bras With Underwire Again?

Or, do you not wear one until you stop breastfeeding?