I had a totally torn/ruptured bicep tendon repaired/reattached and bone spur removed. As far as fashion ... I had my surgery in late December so I went braless for a few weeks and always wore two layers of clothing -- one large t-shirt type layered over with a zip or buttoned sweater or hoodie. Just be sure to leave more time for showering, hygiene, getting dressed. etc. as it is all at a much slower pace.
When you go for the surgery, be sure to have a large zip or button top so you don't have to put your slinged arm into any clothing sleeve when you leave the surgical center.
I didn't have any fancy equipment for rehab. The orthopedic surgeon supplied me with a ice-thingy that could ice almost the entire shoulder region at one time. Ice is good! I quit all pain relievers the day after the surgery cuz I didn't like how they made me feel, and just went with ice until I was ok'd to take motrin again.
My surgeon started PT 2 weeks after surgery. I was ok'd to stop using the sling all the time then too; just when my shoulder became fatigued or was at risk for being jostled (like in the halls of the local high schools during class exchange). He gave me the option of going to a PT center or doing supplied exercises at home. Since my insurance didn't cover much of the PT, I opted to do it at home with instructions from his in-house PT who also supplied me with some tools/equipment. I did some type of PT exercise twice a day, every day. I started light aerobic exercise (walking) after the 2 week check-up and started lower weight exercises (dumb-bells only) about that time also. At the 4 week checkup, I was encourgaed to start upper body with light weights and bands and listen to my body and not overdo it. The dr said my progress was as good as, and in some ways, better, than people who use a PT center.
I am so glad I had the surgery. My shoulder is sooo much better. I'm lifting more than I did before the injury too. Range of motion is good also, not perfect, but adequate and seems to continue to improve over time. I wouldn't worry too much about gaining weight. Focus on your rehab and getting healthy again. Your body will be using calories to heal - I did not gain weight during the rehab process. And your strength will come back. It is pretty cool to be able to notice such great improvements over time.
I hope your surgery goes well and your rehab back to health is quick too. Best wishes, Deb