Bridal trousers (srawelin khatem) form part of the distinctive outfit traditionally worn by brides in the Siwa oasis, Egypt. They are made of white or black cotton and very wide around the waist and hips. The lower part of each trouser leg are decorated with panels of embroidery. The embroidery yarns used to be floss silk, but by the late twentieth century a rayon imitation of pure silk, perlé cotton or cotton threads were used.