Cocktail dress in purple and black flowered silk with belt

Silk printed with purple flowers on black ground. A: Cocktail dress, off-the-shoulder neckline; sleeveless; fitted at natural waist; bell overskirt with uneven hem over built-in crinoline and straight skirt; proper left hook and eye/ zipper closure; black silk taffeta lining. B: Narrow self fabric belt with covered buckle. Embossed on belt: Trigere.