Or, how to find WiFi with your clothing:

As an example of AwareFashion we designed a shirt that senses switched-on mobile phones in the proximity. The shirt looks like a fashionable normal shirt, however if mobile phones are near the shirt glows unobtrusively at the end of sleeves. The design is orientated at the human sensory perception. Humans sense their environment with sensory cells, that generate electronics impulses which travel though nerves tracts and are processed.

...via SmartMobs