Packing for Delivery

I've been packing the items needed for delivery of the babies. I've got a small case of items for me and I'm also working on items for the babies. I have a list of items I should take, but it's hard to know what size items I should pack for all of us. Will the babies need preemie outfits or just the regular newborn clothing? How much smaller will I be when the babies are delivered? I know I'll probably be wearing some form of maternity clothes home, but I'm not sure what to take - larger or smaller maternity wear. This will probably be like packing for most trips I take. I'll overpack and have much more than I need.