NEW YORK — Remember all those blinding brights of spring? For fall, many designers are turning down the wattage in favor of classic flannels and pinstripes in neutral tones. At DKNY, Donna Karan delivered a rare hit in what so far has been a sleepy season. One of her favorite shapes was the high-belted jacket, which here gives a lift to traditional banker’s stripes. For more on New York, see pages 6 and 7.