Leather Jacket with Pink LEDs
This hip-length black leather jacket has about 50 pink/purple LEDs mounted in grommets.
When the LEDs are off, they look like shiny studs that are an intentional part of the design (because they are!), so it's easy to blend in and pretend you're wearing a normal coat.
Then, when you're feeling a little flashy, you can turn it on and select one of the pre-set patterns to match your mood. The default mode is a soothing pulsing fade, with a pace similar to a hearbeat. Other options include a steady glow, a random twinkling effect, or fast random flashing.
video
The clip below demonstrates some of the patterns.