Vogue Paris Original 2311; ca. 1970; Yves Saint Laurent - Misses' Two-Piece Evening Dress. Fitted top with scoop neckline and front button closing has full length sleeves. Gathered skirt in regular or floor length has pockets in side front seams. Featured in Vogue Pattern Book April/May 1970, and in Vogue International Pattern Book December 1970/January 1971