Sister Mary Dresses for Women on Sale up to 90% Off: Poshmark Sister Mary Sister Mary Sara Tiered Dress Sister Mary is a clothing brand inspired by Mexican culture and traditional dress. The brand's pieces often feature rich embroidery, unusual color combinations, and unexpected touches. The brand's name comes from Sister SISTER MARY (Ivy Jane) Stripe MARYLOU Embroidered Floral Dress Sister Mary Dresses Sister Mary Orange Embroidered Cactus Dress Poshmark