Though it was 8 years (mostly ductal in left breast) ago I used Opp-site with a telfa pad. I had gotten a small infection at one of the stitches so the keep dry lasted a bit longer along with antibiotics. All up it was no more than 4 weeks. they had to delay my radiation till it all cleared and healed, I also wore a soft T shirt under my surgery bra. My stitched area was under my breast along with a 2cm square of patchwork on the breast. (Breast Conserving surgery). The armpit scar was good just the scars were sensitive hence the T shirt. ( thankfully it was cooler weather.) I got some dressings from outpatient clinic then others I got from chemist. If your not sure speak to a breast care nurse. Due to radiation etc I kept wearing a bra for quite some time, I switched to Ahh bras mostly because I had gotten used to wearing one to bed now its only occasionally.