for my first birth , I packed those kotex overnight pants for myself as it was comfortable then the ones hospital provides. toiletries , socks , charger, undergarments. clothes I just wear back what i came in with.
for baby , just packed swaddle , mittens , booties & 2 sets of clothes (rompers/jumpsuits). I didn't bring much as mostly were provided by hospital and I didn't want to overpack.