If you're like me and wish Apple had not made its Pencil smooth and provided a built in clip so that it can attach easily to your pocket... the clip from a standard tire pressure gauge works well. Just crimp it a bit so that it fits snugly. It'll slide around a bit, but it's far better nothing! (I thought about this after searching fruitlessly for and trying clips off of existing pens.)
Sorry if others have already posted this...
Sorry if others have already posted this...