One of my favorite sites for baby and children's clothes is Hanna Andersson. Yes, they are a bit pricier, but the quality can't be beat, and they last really well. My boys live in Hanna's sleepers, which come in one piece (for baby) and long john styles. Now there is a new line of "Celebration Sleepers" in organic cotton. The line includes designs for big sisters, birthdays, and more. By the way, we also love the Hanna's Swedish moccasins.