just chiming in as a postpartum nurse. i don't care what my patient's wear as long as they are comfy. i wouldn't recommend anything with shorts/pants unless they are easy to get pulled down for the perineal checks. i wore nursing nightgowns when i delivered. they had gowns with nursing holes, but it just wasn't as comfy. our gowns don't have nursing openings and that makes it hard to breastfeed if you aren't comfy with people seeing all of you.