I saw this on Pinterest and loved it! Since the cold weather came I debate on whether to do snowsuit or juts blanket. I prefer just blanket but it always slips off and don't want my baby to freeze. So I made this carseat blanket that goes under the straps and then swaddles baby. I also adore the fabric I found for it. I found some boy fabric I love even more, but I made the girl one first.
I also listed this on my Etsy shop, if your interested view here:
http://www.etsy.com/shop/HappyHomeCrochet