For next spring the elements of grunge — the freeform layers, the dresses over pants, the plaids, the little-girl frocks and ripped lingerie, the Birks worn with socks — all take a decidedly ladylike turn. Grittiness is transformed into prettiness with lovely color, delicate sheers and upholstery florals. but the rebel spirit lives on in oversized proportions and a palpable sense of anarchy.