It’s a Space Invaders Light Up T-Shirt!!!! This is the ultimate in uber-retro-geekiness (URG). You can get this shirt in your choice of one of the four types of Space Invaders:
This officially licensed shirt is powered by a removable (for washing) battery pack that runs on 4 AAA batteries. It definitely makes a cool statement and costs about $38 from Firebox.
LED Safety Slap Band Armband for Cycling, Running, Jogging, and Walking - Best Reflective Flip Belt for High Visibility - Best Safety Gear for Women, Men & Kids - Safer Than a Reflective Vest - Blue