I used the pattern and method from sewshesews.wordpress.com (except I don’t patchwork my fabric like she did). Love her method of sewing along the traced lines and then cutting with pinking shears. I like to also put nylon fabric in between the layers instead of batting.
I thought putting in snaps was also much cuter than velcro. I used the Babyville Boutique snaps.
I usually buy my fabric at Joann’s or Etsy. My favorite shop on Etsy is Lucky Kaeru Fabric – they have the cutest stuff!