@Pip47
My lumpectomy scar is on the outer bottom corner of my right breast, right where the seam of most bras sit - ouch!
The most comfortable bras that I found are sold in Target. They are front hooking post surgical bras, very soft and the side seam is approximately 2 cm away from my scar.
They are so very comfortable I am still wearing them 2 years post surgery. The bra sizes are 12 to 22 in a cup range of B to D. They have a pocket for a prothesis if required.
I found that after surgery I could not fasten back hooking bras, my right arm would not cooperate.
My only "whinge" about them is that the straps are not adjustable (not really a problem) and they look like "granny" bras!!!