A: Basically, yes. Pittsburgh, with four distinct seasons, isn't one of those tropical climates where you can wear khakis nonstop. Although we've had some recent Indian summer warmth, khaki pants should have been cleaned and packed away by early September at the latest. Like seersucker, khaki fabric is too lightweight to wear in cold weather. For those who don't know what to replace it with when jeans won't do, options range from wool blends and corduroy to moleskin and suede.