Tailor's chalk is a type of chalk used in the making and tailoring of clothing. It comes in the form of small rectangular pieces, usually about 5 by 2 inches in size. The colors of tailor's chalk vary, but in this case there are four colors available: white, blue, yellow and red. Applying the chalk to the fabric allows the tailor to make precise marks for cutting and sewing the fabric. The chalk is easy to wipe off and does not leave a permanent mark on the clothing.