When a coat loses a button, your outerwear doesn't always look right, and you may not be adequately covered up on a cool day. Coats usually come with extra buttons, but it can be hard trying to figure out the proper way to sew one on. However, you can accomplish this feat rather simply by following these tips.
Thread the string into the eye of your sewing needle. Make sure this is not the end you knotted, as the end you knotted should stop at the eye of the needle when the thread is completely pulled up. Locate where you want to sew the button onto your coat. Come up through the coat from the underside of it--but do not sew down. The needle should be poking through the coat.
Pull the needle and thread up through the first hole. Slide the button all the way down until your button touches your coat. Take the needle and thread it down through the second hole.
Locate the third hole in your button and carefully thread your needle up through that hole. Pull the needle all the way up until the thread is straight up. Take the needle down into the button's fourth and final hole.
Keep hold of the needle, but turn the coat so that you can see the underside of where you've just sewn. You should see four places where the thread is connecting with the coat. Lay the coat out on a flat surface and carefully lay the needle out of the way for a moment. Take the knotted end of the thread and gently but firmly pull it up. When you've pulled it up out of the coat enough, tie the knotted and unknotted ends of the thread underneath the coat.
Set the needle down someplace safe and turn the coat back over. Lightly tug on the button to make sure it is secure.