Japanese lingerie maker Triumph unveiled a Solar Power Bra featuring a solar panel that can generate enough energy to charge a mobile phone or iPod.

The Solar Power Bra requires a solar panel to be worn around the stomach to gather direct sunlight. The concept bra will not be in stores anytime soon, said Triumph spokeswoman Yoshiko Masuda, as "people usually can not go outside without wearing clothes over it."

The Green-colored brassiere should not be washed or worn in the rain as well.

"It is very comfortable and I can really feel involved in eco-friendly efforts as well," model Yuko Ishida said.

Eco-friendly items are now fashionable in Japan, and the Solar Energy Bra follows the company's other green-themed undergarments that include a bra that turns into a reusable shopping bag and one that featured metal chopsticks to promote the use of reusable chopsticks.