Now Here's a Flashy T-Shirt

It's not exactly underwear, but the sound-activated T-Qualiser t-shirt from Flashwear is a revolution in geek club couture.

A wafer-thin, sound-sensitive electro luminescence equalizer built in to the chest responds to music just like the graphical EQ on your home audio system. The equalizer is even adjustable so it can effectively process low-level sounds in chilled out spaces or the high intensity beats of loud clubs. One hundred percent cotton and hand-wash only, the t-shirt requires four AAA batteries. Available only in black, sizes small, medium, large and extra large. $39.90 at DealByEthan.com.