knee brace advice

 I've been having problems with my knee lately and was given all sorts of dire possibilities, but it turns out that it's (thankfully*) only an inflamed patella tendon that is somehow (I didn't ask for details) causing my kneecap to grind against bones when it isn't supposed to.

The problem I'm having is finding a brace.  I'm quite plus-sized, and need a brace that will both hold the kneecap in place and is a wraparound brace, as opposed to a slip on brace,  because it will have to go over my clothes.  I went through quite a few today and they were either too small, too loose around the knee, or slip on as opposed to wraparound.

Any advice?

*thankfully=most other possibilities meant surgery, and this will hopefully fix itself with therapy