I got changed into one of my nighties almost as soon as I arrived (was recommended to by th mw), forget if I had knickers on, I dont think I did as I had several internals, and a monitor thing clipped to bub's head. THe nightie ended up hitched around my middle when I pushed in the end. Or was it off by then? I can't remember to be honest!
One thing I should have packed more of in my bag were more nighties, bras and breast pads, as when my milk came in a couple of days later, I was still in hosp, and it came through bigtime! I took 10 pairs of granny knickers with me, and that was just enough too!