Hi there, I don't know when you had your mastectomy, I had mine exactly 4 weeks ago, including reconstruction. I found until the last few days that the skin between the breasts and about an inch up the breast was maddening sensitive. Painful even, sometimes felt like so cold it burned. Any loose clothing that touched the area was painful.
I found wearing a close fitting singlet top or arh bra or soft cotton post op bra helped to ease the sensitivity. But they had to be close fitting, not slip at all.
I am very pleased to have feeling at all and now after 4 weeks it feels back to normal.
Hope this helps, Louie.