Hola Mariposa and welcome to TE.

I love leg warmers but I prefer wearing tights when it becomes cooler, below 8 Celcius say. They keep my booty warm.

Leg warmers are pretty much all made of the same lycra, some with and some without some warmer fuzz on the inside. Some have zippers so you can take them off without taking your shoes off as well, but those haven't worked well for me.

I have Sugois and like them, except those with the zippers. I don't think fitting your knee brace will be an issue.