They have them on etsy and I've seen a pattern that someone posted on here but I can't remember which discussion it was under. There are definitely lots of avenues. They're usually called "leggies" and google should be able to help you narrow down what you're looking for.
I am making a pair. Save your dosh and make your own! I got long pile red faux fur, a meter and a half, at Fabricland for around $13. Here is a video tute I found which is good but I think needs adapting:
Then Ilaniowear, a funky clothing design company, ceased to be and posted all their patterns for fans to use
I make my own b/c I think the ones you buy aren't flared out enough.
The trick is measurement. You must measure your calves carefully.
One you cut out the shape should look like a triangle with the very top cut off... (Sorta)
Also another trick if you are going to use a sewing machine... I have kind of a cheap sewing machine but it does the job.
However, the fur likes to get stuck sometimes and jams my needles and sometimes even breaks them.
So if you cut the fur off of the material (Only where you're sewing the seam) it makes it much easier on the sewing machine and on your emotions.
I want some of these. I just got a very basic sewing machine to try and learn how to sew, mostly to make alterations to my clothing and to upcycle. But I just might give making some of these a try once I learn my machine!
They can get hot, it depends on where you are. Hot days are rough unless you are practially nekked (hence gogo outfits haha) but normal weather I never get too hot. I just were someething shorter so my body heat doesnt rise too much. Plus mine breathe some.