sweetpoison07, on 07 March 2013 - 00:19, said:
it was wrapped around the knob when I pulled the pants off it
Sorry, I'm in a childish mood lately
Edit: On a more serious note, I have used a soldering iron to melt the plastic from a CD case in the past. You slowly build up layers of molten plastic directly onto the broken part, fusing them together. Just make it roughly in the shape you need, then file/sand it down for a perfect fit. You could also put a small screw in their first, to give the plastic extra support.
Not everybody's idea of fun, granted, but it's an option.