Pack loose fitting sweat pants for the hospital checkout. Make sure they give you a large and small collection bag for the catheter. The small one you can strap to your leg during the day and at night you can swap out to the large one to hang on the side of the bed.
Once home I was able to adjust the leg bag straps up high enough so that the collection bag was out of sight and I could run around with baggy cargo pants and no one noticed. I did not use underwear during the days with the catheter in place, just wore shorts or sweat pants.
I bought a box of pads and planned on wearing “one size to large” jockey briefs with a pad in them however when they pulled the catheter to my surprise no drips or leaks so I threw the box away when I got home.
Most of my friends who went through surgery had a little leakage for a week to several weeks that eventually stopped.
One last thought, your bladder went through a lot and you may have some urgency to go more often than normal. You will need to drink lots of water for a while and be cautious about spicy food, alcohol, and coffee as they may increase urgency in the short term until your bladder settles down.