Montage by Mon Cheri - 217943 Square Neck Sequined Evening GownPlease refer to Montage . The Ivonne D Collection Size Chart. Surround yourself with decadence in a dazzling evening gown from Montage 217943 by Mon Cheri. This dress has slight cap sleeves with a square neckline and cutout detail at the center of the bust. The fitted bodice shows an overlay of floral patterned sequins throughout. The skirt has a classic fit and flare silhouette, tapering smoothly to the thighs and then flaring gradually to the floor.