Sigils for use with apparel

Apparel is disclosed that can be worn to assist an interactive game in tracking the movement of the wearer. The apparel may include one or more tracking marks formed of designs, patterns, or reflective materials that can be easily tracked by an interactive game. By providing tracking marks on apparel, rather than using a special-purpose device that must be separately worn, a player may enjoy a more natural feel when playing the interactive game. A user can wear the apparel for everyday purposes, and then simply begin playing the game wearing the apparel without having to put on any additional equipment. The apparel may use reflective materials, and the interactive game can employ a camera and a light source configuration where the camera is located within the observation angle of a player employing retroreflective materials reflecting light from the light source.