I really really wanted a carseat canopy for this baby, my daughter is just barely too old for them. They were out, but just barely, so that I saw no one use one until she was about 6 months old. I used this tutorial, and was surprised at how long it took me. That says nothing ill about the tutorial, just my skills. I wanted my cover to have ties not buttons or Velcro.
Then I just used calico on the inside, I didn't want anything too warm. Our babies move young, so he'll be crawling before the winter is over, I won't have a very long shelf life on this thing. But the cover matches the carseat!