You've just seen the perfect sport coat for an upcoming event. But nothing makes the heart sink quicker than realising the perfect style sport coat is not the perfect size. The good news is that with just a few items and a couple of minutes, you can alter the sleeves on a sport jacket without hassling with a trip to the tailor, and leaving you to do what you do best: look good.
Use a seam ripper to remove the seam from the inside of your sleeves. Assess the sleeve length. For longer-armed men, taking out the sleeve seam might provide the proper length needed.
Put on the coat after ripping out the seams and assess the sleeve length if you plan on shortening the sport coat's sleeves. Mark one line with tailor's chalk where the sleeve reaches your wrist. Mark another line about 3/4 inch below that one to indicate where you will cut the sleeve fabric.
Cut on the second line straight across with scissors. Fold an inch of the fabric inward and secure with stick pins to create a sleeve hem.
Sew the hem in place using a needle and thread. If your sport jacket has a lining, fold the lining back about 1 inch shorter than the sleeve and secure it by sewing with needle and thread.