You'll only need the one going home outfit I would assume, maybe an extra shirt, nursing tops if you're BFing... just pack the minimum, you aren't going to be there long, all willing.
I packed for myself a nursing tank, a robe, a nightgown, a button down henley, slippers, and that's about it. I'll throw some toiletries in a bag when I get home from my holiday trip and some snacks and call it a day.
Baby has his going home outfit in two sizes, some hates, a few onesies and sleep sacks, lots of CDs and some wipes. Oh and his teddy bear with daddy's voice recorded on it. That's about it.