The air smells crisp and the leaves are changing colors, a sure sign that itas time to hit J. Crew and buy yet another roll-neck sweater. A chain that has outfitted all of Connecticut and much of the Midwest, J. Crew serves up the basics: plain-front pants, button-down shirts, practical belts and shoes, staid swimsuits, and hordes of striped sweaters. The look is natural and appealing, sometimes borderline boring.