Hi
If you have access to a cancer nurse or someone from your oncologist team, ask them about the free bra supplied by Berlei it is very soft material and still quite supportive with no wires.
I know that most of Bras and Things have post operative bras , but your cancer nurse can measure you for the correct fit which changes after surgery, ( swelling and bruising ) .
Personally I had a double mastectomy with no reconstruction but I couldn't stand anything tight or rubbing for about a month afterwards , but since I have no boos I forgo the bra now.
Good luck .