It signals that you are part of the in crowd. In a land where the uniform - jeans, hoodies and flip-flops - is purposefully nonchalant, and where no one would be caught dead in a tie, wearing flashy socks is more than an expression of your personaity. And for today’s tech entrepreneurs in high-flying Silicon Valley, it is flamboyantly colored, audaciously patterned socks. For the glass-ceiling-shattering women of the 1980s, it was shoulder pads. For the Mad men of 1950s New York, it was briefcases and fedoras. For barristers in 18th-century London, it was shoulder-grazing wigs.