Like Trip's DD, I put all of my DD's clothes in plastic bins. As she grows out of things, I put them aside in a hamper until I have a good amount of items. Then, I wash and fold the clothes and stick them in a bin. So far, I have two full bins, and I am working on a third. In our old house, I just stacked them in her closet. In our new house, I am going to use the closet under the stairs since most houses in FL don't have basements.
I also store my maternity clothes in the same type of bins.