You may have bought a jean or cotton jacket that's a bit big for you, or you're giving a jacket of yours to a friend or relative who is smaller than you. You can shrink it at home for free instead of buying a smaller size or paying to have it tailored. Shrinking jackets can only be done with denim and cotton jackets. You won't need any speciality materials. All you need is your washing machine and your dryer. Do not attempt this method with polyester, acrylic or leather.
Place your jacket into the washing machine.
Set your washing machine water temperature to the hottest it can go.
Let your washing machine run once.
Hang your jacket up on the hanger or on a clothesline until dry. Test to see if it has shrunk enough. If so, you've finished. If not, continue onto Step 6.
Repeat Steps 1 through 4. When your jacket has been washed again, rather than hanging it up, place it in the dryer.
Set your dryer to medium heat. When the cycle is done, try the jacket to see if it has reached the size you want. If not, repeat Step 6.
If it is a black or dark-coloured jacket, use detergent that is for dark colours so that the jacket doesn't fade.