I bought a really hilarious old nanna style nightie which buttoned at the front. It was super cheap at Target (any wonder when you see it, LOL!) but it was comfy and made breastfeeding and engorgement a lot easier to deal with. I only wore it at night though.

During the day I wore comfy trackies (the ones that have the waist band that folds over as I'd worn them while pregnant - kept my huge belly warm!), Bonds maternity singlets, a fleece jumper and slippers. I had my dressing gown which was great at night as it always seemed quite cool in our room and I was up and down a lot with DD and fed her in the lounge in the nursery a couple of times.

Best of luck!