Making one could require more time and effort than you think. There are not only the cost of materials and the time involved, but basic decisions involving design and construction. Take a look at this video:
Those moms who weren't satisfied with their results? I probably muttered their exact thoughts when I was working on my first Car Seat Poncho for my own son, back in 2004. The genuine Car Seat Ponchos available today are the fruit of many unsuccessful attempts and many different prototypes, resulting in a product that keeps your child warm, is easy to use, fun to wear -- and gets tons of compliments and admiring glances everywhere you go!