Tikhrāṣah: (Arabic: kharṣah: to mend), meaning gusset. Triangular or rhomboidal piece of fabric inserted into seams to add breadth or reduce stress in tight-fitting clothing. Gussets were used at underarms on tunic dresses, side sleeve panels on overgarments (thāwb) and undergarments (ṣarāwl). It is also known as (bāṭ).