Newbie3312 This suggestion may come too late to you. Depending on your rate of healing.
I have just bought a singlet top that takes a prosthesis.
Good enough to be worn as clothing or under clothes. Lots of colours.
You don't sound like you have a prosthesis. But this may be a comfortable solution.
It is a top that has like a swimsuit bra top under/in it.
No wires, probably not a perfect shape, but may be the answer temporarily.
It's made by Amoena. I got mine only yesterday from the mobile service that sells bras and prosthesis'
You could look online.
My Radiotherapy starts in about 4 weeks.