Sweaters will become bigger and looser, mostly because of improper washing and hanging methods. If wool clothes become loose after being worn for a long time, we can use a steam iron to help them. First, put the steam iron about two centimeters above the clothes with one hand, let the steam soften the fibers, and then set the sweater with the other hand. With both hands like this, I hope that the sweater can be restored to the original state of tight fibers as much as possible. When drying sweaters, in order to avoid the sweater from getting bigger and longer, it is best to spread the sweater flat and dry it, or spread the umbrella out and hang it directly on it. If you feel that it is not easy to dry, you can also hang the sweater with two or three hangers and put the tail on the hanger, so that the sweater will not be deformed.