What is the mandatory equipment for a pro MMA fight?

What is the mandatory equipment for a pro MMA fight?

Bas Rutten (Former UFC Heavyweight Champion) gives expert video advice on: Do all the MMA leagues have different rules?; Do all the MMA leagues use the same weight classes?; What are illegal MMA strikes? and more...

The equipment for a professional fight is the gloves; the open hand gloves so you can grab people. A mouthpiece is mandatory, and each fighter needs groin protection. And that's pretty much it. For the rest, you cannot wear normal jeans, of course. You cannot wear anything that has pockets, where people can get stuck in with their fingers or something. It needs to be all smooth, no pockets, and that's about it.