PJ's.
You don't need anything else...not clothes anyway! lol

Singlet tops and comfy PJ pants. KMart etc have lots of larger size pj bottoms, comfy, light and cheap as.
I bought a couple of B2B Nighties from KMart, V neck sort of ones with spaghetti straps for feeding - still have on and will take it again it is soooo comfy lol
Also a couple of feeding bras and those crop tops bras.