I found this pattern 5 years ago when I was expecting Eva and have made some for every baby since-they keep getting lost. Like socks. On the plus side, these are easy to make. Actually, I think it was a different blog, but same idea. I usually still buy a box of disposable pads for when we are gone from the house (especially for those first few weeks of my body trying to regulate my milk supply), but these work pretty awesome.
For my project, I used an old sweatshirt and an old sheet. The sweatshirt provided the fleece (1 layer-the outer layer) and the sheet provided the flannel (3 layers). Like I said, these are VERY simple make, but the cutting out can be trying. My mom and I were still overrunning the kitchen table after 3 hours of cutting when dad come home. :) Good thing he's used to our projects. I used the back half of the sweatshirt, which got me 15 pads. For the pattern, you need a saucer, a marker and a piece of paper. Trace around the saucer and cutout. There's your pattern.