I only stayed at hospital but we had pads provided and flannels (which are also helpful for toileting, so you won't need to take toilet paper). I went through about a dozen undies in the first 2-3 days

so get a couple of packs. I grab the Warehouse ones and go for hip ones not full briefs.
Don't take washable breast pads, just stick with disposable so you can chuck them straight out and they won't hang around and get smelly. I found t-shirts ok (and there's a sheet to cover your tummy if you want anyway). And don't forget a pen.
Unless you are leaky already you can expect to get your milk in at around day 3-4, so until then you probably won't need breast pads. (=don't pack too many

)