Types of Baby Clothes - Bibs
You'll need bibs. Lots of it. Bibs catch drool, food, and every conceivable liquid/mush that comes out from babies' mouths. There are many styles of bibs - cloth, plastic, silicone etc. Ours are usually double layered - the top is cotton, and the bottom is waterproof so liquids don't seep through the bibs.
Nursing bibs are larger and you can put them over your shoulder/chest when you're holding your baby against the area.