Crimps of plain woven fabrics in various relaxation states were measured and compared with the crimps calculated from the geometrical models for plain woven fabrics such as Peirce, straight line, circular arc, racetrack and lenticular models. Only straight line model was suitable for the crimping behavior of unrelaxed plain woven fabric, while circular arc and Peirce models were only applicable to crimps of completely relaxed flexible fabric. When fabric in more relaxed, crimp of fabric could be interpreted by applying racetrack and lenticular models.