The No-Contact Jacket uses a 9V battery to shock anybody grabbing you. It has a rubber insulating layer to prevent the wearer from getting shocked and covers over the hands to protect hands. It's activated by squeezing the palm switches- a natural reaction to getting grabbed. and 9V with boosters to boost the voltage powers a taser or cattle prod.
"To warn off any potential unauthorized contact the No-Contact Jacket produces visible and audible electric arcs between two seams on the wearer's upper right shoulder...The visual arcing indicator is functionally important since the rest of the electric current is invisible under the surface of the jacket."

This would totally be a confidence booster walking around the terre haute ghetto at night. Or around some attention-starved Rose boys...