Kim I have made it in old sheets as a trial ages ago - the pattern is great, it is the type of pattern that will fit forever. I think when I made it for her initially she was around 2 and I made the size 3 and it still fits her now (pity it is made of old nana sheets!) pattern was easy as to make and follow, now I just need to find the perfect fabric. I was reading on her blog that the one she made recently she used quilt batting in between to make it really warm. Fleece is a great idea too!