Ponchos are comfy, safe, and warm! There are a number of poncho options that work well with car seats. The key feature is that the poncho doesn’t interfere with the harness — the poncho covers the front of the child while adding no extra bulk between the child and the harness.
How many yards do you need to make a carseat poncho?
Fleece. You’ll want an inner fabric and an exterior fabric (if you live in a warmer climate, you could probably use just one layer). I could have used 1.5 yards easily for this, but I’d bought 2 yards to be safe. The fabric I used for the Star Wars poncho can be found on Fabric.com.