An article of wearing apparel such as a rigid opaque hat or a multi-layer belt has light emitting diodes mounted therein for being viewed, the terminals of the diodes and the circuitry for controlling the same being concealed within the article of apparel or on the person of the wearer. Control circuitry...http://www.google.fr/patents/US4231079?utm_source=gb-gplus-shareBrevet US4231079 - Article of wearing apparel
