Here is a LED T-Shirt with WiFi that you can interact with using an Android app. The shirt has a LED panel that can show games, text, and video effects. The Panel is constructed of WS2812B LEDs and waterproof. The WiFi controller software is written in the C language.
The app lets you show scrolling text, games, animations, and icons on your shirt. You also get strobe, pulse, and other effects. You can support this project on Kickstarter.