You want lots of very thin, loose-fitting clothes. The second most important thing is how easy it is to change the diaper. Throw out any clothes that don't have snaps in the crotch. Babies don't need shoes until they start walking. You can use socks until then.
Small socks tend to be fashionably colored.
Girls clothes tend to be loose-fitting, which can hinder crawling and walking. If you have a girl, be aware of this. Shopping The major producers of baby goods are Fisher-Price, Evenflo, and Graco. I have found Evenflo products to be consistently good. Graco is a good cheap brand for strollers.