I'll echo the sentiments of high underwear absolutely. You really really do not want anything sitting on your wound. I actually found online a product called C-Panty which are high cut and have something in them to help with scar formation. You can't use them until after the wound has closed, but they're something I'm looking into for next time.

I'd say take your own pillow as wel JIC the hospital doesn't supply you with enough, because you really need to be comfortable afterwards & it helps when you sit up.

Oh & some really yummy smelling shower gel. It makes you feel so much better smelling nice after getting the yucky hospital / surgery smell off you.

For bub the hospital should give you a list of what you'll need, if anything