Is there a way to print / draw a circuit on to clothing?

See http://www.plusea.at/ for all kinds of wearable electronics. Gluing strips of conductive fabric is probably better than conductive glue.

How To Get What You Want by the same people has more details:

• Traces
• Conductive materials

Maybe conductive glue will work on fabric. It is definitely cheaper than the CirquitWriter pen so if it doesn't work, there's not much harm :) "Wire Glue" is being sold in the US but you can also try to make your own by mixing graphite and glue. There is an instructable that explains the process.

Xerox has just announced a silver ink for wearable and throwaway electronics. I think it's a bit early to use in your projects. The Silver Pen is an interesting idea. I don't know if it'll work!