You will be so happy you did.
Disclaimer: Altering your car seat may void your car seat’s warranty. Make It and Love It is not responsible for any decisions made regarding your own car seat or fabrics chosen. I do, however, show how to use the exact same batting from the original seat and keep the same shape and dimensions, but just change out the top layer of fabric. But the thickness of the fabric is the same…not changing the thickness of the cover at all. However, in the event of an accident, your car seat may or may not be replaced with a brand new one. So consider the risk of having to pay for a new one, if your seat was damaged in a way that your seat’s company would have been willing to replace it for free. (I have heard of companies replacing the seat even though new covers were used, and other scenarios where they would not replace the seat. So keep that in mind.)
Also, flame resistant fabrics can be used in event of fire, so choose fabrics accordingly. (Consider using a spray such as this to treat your fabric, to make your fabric flame resistant. But do some research to find a product suitable for you.)
(Keep in mind that every car seat brand constructs their seat covers a bit differently. But with a visual of how to deconstruct a cover, you’ll be able to do this with any car seat brand.)
First of all, I purchased the yellow fabric at HB Fabrics here. (Alexander Henry Amelie in Yellow, Matisse Collection) And I bought the gray fabric here. (Ty Pennington, Lace Taupe) I actually purchased the thicker Decor Fabric in the grey because I knew I’d be using some of it for the canopy, and wanted it thicker. It has a nice sateen finish and is very soft. But the Ty Pennington collection also comes in the regular weight cotton.
I purchased 2 yards of the yellow and 1 yard of the gray. But the amount of fabric you’ll need depends on how much fabric you need for your canopy, how much of the old canopy/car seat fabrics you use, how much of each color you use on the car seat, etc.
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But pat yourself on that hard working back of yours, because you just created your own custom car seat cover and canopy.