I'd suggest laying in a small supply of Depends and maxi pads, then see how you do after surgery. A few lucky folks have little incontinence whereas others (most?) aren't so lucky. Keep in mind that after your catheter is removed, you'll be so damned happy not to have it you almost won't care how much incontinence you have (that's how I felt). Later, as life starts to return to "normal", incontinence probably will start to bother you. During my initial 18 months post-op, I just found it easier to wear Depends because I'm fairly active and didn't want to think about it. More recently, I try to wear mostly maxi pads in my tighty-whiteys for comfort (the Depends are hot, temperature wise 🥴). I purchase my products at the grocery store mostly but I believe you can find them a bit cheaper at BJ's or Walmart. Be sure to take someone with you when you shop, so that other shoppers will think the adult diapers are for the other person. 🤣

As far as clothing during recovery: any loose fitting garment while the catheter is in (I just wore boxers), then comfortable clothes once you're catheter free. I'm retired, so have less of a clothing issue (I just wear whatever I like), and generally try to avoid tight jeans, but that's just my preference rather than any limitation because of the prostatectomy or incontinence.

I wish you the very best of luck with your surgery and recovery. Just before and after my surgery, I watched this series of YouTube videos about the recovery process, and found them very helpful for planning my own recovery. Maybe you will too.