Agree...really varies by industry/location/client meeting, etc...
Most CT (and Manhattan) hedge fund guys dress casually (dress slacks, french cuff dress shirt, no tie, and a sport jacket), much like SiliconValley venture capitalists/tech executives....
But, in Manhattan, nearly all investment bankers and private equity guys dress in suit and tie....
Net, net, almost no one who matters wears a tie in Greenwich or SiliconValley