Spadea S-296; ©1958; Unprinted pattern. "That truly American fashion, the shirtwaist dress, has won international acceptance and popularity and is prominent in all the couture collections. This one by lachasse, easy going and easy to wear, has subtle dressmaker details that lend it smart significance. Pleats, so very important this season, are handled with great effectiveness and newness. The front has side pleats, narrow on the bodice but graduating into greater width as they open out toward the hem of the skirt. In back, there is a set of box pleats, again narrow on the bodice and fanning out in the skirt. The collar of the simple neckline is buttoned onto the opened revers. The sleeveless version makes up handsomely in linen, shantung, plain or printed silk. In fall, you'll want to repe