If you're looking for a low-budget Tony Stark costume to don for "Captain America: Civil War," check out this wearable arc reactor posted by Redditor iltl64 over the weekend, made mostly out of garbage from the kitchen trash.
He built this accessory from "Iron Man" last Halloween using cardboard, copper tape, a few surface-mounted LEDs, a cell phone battery, a trimmed-down tuna can for the housing, and some glue to hold it all together.
Impressively, the whole thing only took him five hours to build, which includes the time to learn how to work the LEDs. As you can see, it glows brightly underneath a shirt and supposedly lasts for a few hours on full brightness. He even uses the device as a headlight for his bicycle when he's not fashioning other life-preserving power sources in his industrial complex.