Hi Gerry, my surgeon said as long as the scar didn't sit on the line of the wire, I could wear underwire anytime. Unfortunately for me, the wire crosses over the scar and even a year on from surgery gets quite sore if I wear the underwire. Have gone to soft form bras with really good support but they can be hard to find. Did find my breast had a lot of swelling from radiation, which lasted months, and the post-op bra gave really good support. A girls just gotta be comfortable :)