Her Sept. 12 Lincoln Center show at times felt like an advertisement for the wheat farmers of America. Sheaths of the crop adorned her dresses in bold prints, but rendered in understated hues. The overall effect surprisingly wholesome. Burch, who will open a boutique in Copley Place in November, saved her flash for the end of the show with a flowing sunshine yellow (perhaps sunshine to sustain all of that wheat) maxi dress and more form-fitting full-length cocktail dresses. A pair of gingham day dresses in updated plaids reinforced her all-American girl point-of-view.