Callahan X REVOLVE Sami Dress in Black. - size S (also in L, M, XS) Callahan X REVOLVE Sami Dress in Black. - size S (also in L, M, XS) 62% cupro 38% tencel. Hand wash cold. Unlined. Surplice neckline. Elastic waist with front tie accent. Satin jacquard fabric. Imported. CAHN-WD35. 19-09-24. Los Angeles based brand Callahan is known for their comfy sweaters and perfect boyfriend fits. Their line is elevated by unique textures, materials, and techniques that give each piece versatility and wearability. Designed for cool girls everywhere, Callahan is inspired by effortlessly easy style.