Normal. Wrinkles on waistcoats are usually the result of design and manufacture. The application of these design elements can make clothes closer to the body, better show the figure curve and achieve better waist shaping effect. Moreover, the waist fabric is made of soft cotton or silk, which has good elasticity and adaptability, and wrinkles can better adapt to the shape and movement of the body. Therefore, it is normal for the waist coat to be wrinkled.