I am laughing at the concept. I had a friend who made something for her cat. I laughed at it too. She was so upset that the little monster had it off in 1/4 the time it took for her to put it on. I suggested a heating blanket instead. No cat I have owned would put up with a sweater. Or a costume (those are two second items.. I know.. I tried guilty here too). If you like your fingers, your arms and legs I truly think the heating blanket is the way to go or a water bottle.. mine live on the electric twin blanket folded at the end of the couch.. its cat central and costs only pennies a day to use. I turn it on at night so they can curl up there when I am tucked in my own warm bed. Keeps them out of mine for oh.. 2 or 3 hours (sleep wonderful sleep!).