Wearable technology doesn't have to be useful, it can just be...pretty. The K-Dress from CuteCircuit is a good example of useless prettiness: it's a silk chiffon and taffeta dress featuring hundreds of embedded LED lights.
Inspired by the illuminated couture dress from CuteCircuit that Katy Perry wore to a gala in 2010, the K-Dress has a small snap-in controller that lets you control the embedded LEDs. You can recharge the controller via USB. The dress is dry-clean only, and you need to remove the battery before taking the garment in for cleaning. You can pick up the K-Dress at CuteCircuit's website for $2373.