Has anyone ever used one? Our 19 year old cat is pretty thin and gets chilly, especially overnight. I'd like to find a way to make her more comfortable without running up a huge heat bill. If I got her a warm, snuggly sweater, maybe that would help? Would she keep it on?
Well, I've never dressed a cat. But I do know that cats do not like things put over their heads (unless you accustom them to it from kittenhood). My cats freak out if I try to put a harness on them.
If you try to dress your cat, I suggest a "wrap" style sweater. My Chihuahua had a few of those. Goes on like a saddle and fastens under the belly with velcro. Dunno if a cat would wriggle out of it, but it's worth a try. If you are crafty or have a crafty friend, maybe you can custom-make it with the straps where you need them. A friend of mine made a gorgeous cable-knit sweater for my Chi a few years ago. He was hard to fit, being so small but barrel-chested/thin-waisted.
Or they make heated pet beds, some specifically for cats. Sort of like a heated blanket, you plug it into the wall and it keeps them warm. Like this, but there are various makes and styles- http://www.amazon.com/3193-Thermo-Kitty-Indoor-Heated-Sage/dp/B00176F9AM/ref=pd_sim_k_5
And they make beds that reflect body heat back without using any electricity- I think they work a bit like those space blankets? I'm not sure what they're called, but you can find examples in most pet catalogs.