Yes, sweaters, knitted materials and other clothes will destroy the elasticity of the tissue if they are ironed directly. At this time, you can spray them on the wrinkles with a steam iron. If the wrinkles are not very severe, or you can hang them and spray water directly on them to dry, they will naturally be smooth; Another way is to hang it in the bathroom and use the hot steam generated during bathing to make it smooth. There are thinner and thinner materials such as chiffon, which need to be ironed at low temperature. Don't use too much force when ironing to avoid damage.