SHORT LENGTH: The short hemline is still the prevailing length, from the ultra high to the more popular slightly above-the- knee Donna Karan's DKNY line captures short's youthful mood with a slim plaid skirt and tank top with lace trim. Over it, a short trench coat. PHOTO FROM DKNY . LONG LENGTH: Long hemlines are on the scene and while many designers tried them, none succeed as well as Calvin Klein. Critics adore his new, midcalf hemlength shown in loose, flirty, diaphanous fabrics. A print silk georgette skirt is worn with a tunic top. Pt i0TO FROM CALVIN KLEIN.