On the Ghostbusters The Video Game uniform, a L shaped flash light is seen attached to the right pack strap. These come in two sizes, C battery and D battery. You’ll want to get a D battery sized one. These are plentiful and can be found very cheap on ebay. To attach to the strap, you can either sew a loop of fabric to the pack strap or use a large safety pin through the strap, both work well.