Drill is a strong, durable cotton fabric with a strong bias (diagonal) in the weave. It can be used unbleached, although it is more often bleached, or dyed. The heavier weights were often used in corsets Khaki drill is made into uniforms. Boat sail drill is unbleached and is made into sails for sailing craft and drill is also made into pocket linings. Cotton drill is made of 100% cotton and is widely used for making cook's uniforms (chef's wear) because it is thick enough to protect the wearer from heat. 100% cotton drill is much more cooling and comfortable to the touch than TC Drill. Commonly Used Qualities are ranging from 190 to 240gsm. Note: Price may vary as per quality of product.