While I was still pregnant, Kelli at True Bias released the Hudson Pant pattern. It is a knit pant (although you can use woven fabric if you size it up). I found some french terry cloth at Girl Charlee (my favorite source for knit fabrics) and waited until after I had the baby, so I would be sure to make the right size. They are comfy, and light enough to wear during the hot summer, and I think they'll be nice in the winter as well, with some boots. They have pockets, and are a little roomy above the knee, which is nice. I was between two sizes, and went up to the bigger size, and they turned out perfect.
I ended up with some extra fabric (since Girl Charlee only sells by the yard), enough to make some pants for Emily as well. I used Simplicity 5317; I made them a couple sizes smaller than called for, to eliminate some of the ease, and I lengthened the leg. This is just a simple pant pattern, so it sews up really fast. But, I think I'd prefer to find a better pant pattern if I'm going to keep on making pants for her.