Loose clothing for the next day, definately. They probably will not keep you more than one night unless there are complications, but it's not very serious surgery. You'll be off your face on the post-op pain killers they give you :P so don't drink or drive around for a few days, but they'll tell you that.
You won't get your results until your post-op appointment, but I overheard the nurses talking about how extensive mine was, which was unsettling as I had to wait for a few weeks for my proper results.
I didn't stay overnight for mine either, was just a 4-5 hour surgery and had to be supervised overnight.
They will just look with the camera, and remove endo anywhere they see it and take photos to show you at your post-op appointment. Then they will diagnose whether it's stage I, II, III or IV.
Mine was diagnoed as stage III, and I was put on menopausal treatment for 6 months to try stop it from growing back, then birth control until I want to have kids.
Mine's all grown back though after a year which *****, so I'm bleeding again even though I've been through that menopause and am taking birth contol every day. Laaame.
Good luck :)
All I can say is loss clothes. Well If you are staying over night not to much just some thing to do. I guess I am going off what I bright with me when I had my son. They tell you a big long list and I never needed half of it.When I had my surgery I was out the same day. Just some thing to do I slept a lot after my surgery. I hoe this might help.