I used a receiving blanket, with heavy lining (warm and natural?) for the base and lightweight interfacing for the pockets. Two of the pockets (for pacis and water) are pleated at the side. The top pocket, for a book, is just a flat patch pocket.
If I were to make another one of these, I'd have made the straps at the top a bit wider, and with wider velcro also. Instead of ties at the sides, I'd measure more thoroughly and put velcro straps there as well. (I'm like Claire in that, while numbers are how I earn a salary, they seem to be merely a suggestion when it comes to crafts). The water cup pocket I'd make a bit taller and narrower, and the paci one bigger all around. The lining of the base didn't need to be as thick as it is - sewing through the pleats on the pockets was not pretty. All of that having been said, it seems to be doing it's job pretty well.