Loose waisted pants that come up high. The trackies and granny undies I packed weren't loose enough so did press on my belly. They came above the wound but were a bit tight so created pressure there which was uncomfotrable. As soon as I got home I wore my DH trackies. Don't worry about sizes by the biggest most comfy clothes/undies you can that stay up but are looseish.

I found the bonds bumps singlets were not good for me for the first few weeks while my boobs were settling as they did not offer enough support at the top. After a while they were good though.
button down pyjamas were good but make sure the boottoms were loose. I think Big W had some maternity ones which looked good in the catalogue. The nighties diddn't look too bad either.

Comfy slip on slippers/shoes are a must have.

I found after a few days I didn't need the huge maternity thin pads and could have jsut used normal pads. I ussed the maternity Libra thin pads about 2-3 packets. Have some normal pads at home for when you get home and know the specific brands of the pads you like and colours so someone can go buy them if needed and get them easily.

For bubs I really liked the all in one suits from best and less. They were cotton and self ribbed and were really nice but were cheap too.

Muslin wraps
It depends what your hospital provides though. I preferred to have Ds in his own clothes after the first day then we went to the Hilton where we had to provide everything for him.

Good luck and enjoy meeting your bub

ETA I just realised that you are having your baby on the day my Ds was born. Another cherub for march 31