If your clothes catch on fire, stop where you are, drop to the ground, and roll over and over to smother the flames.Cover your face to protect your lungs from smoke.
 
If your hands are already on fire,you should place your hands behind your pants and begin to stop-drop-roll process.
 
If the height of fire flame exceed 25cm or you think the situation is out of your control, you should escape immediately. In addition, when you only see smokes but no fire flames, it is better not to extinguish the fire. You should evacuate immediately and close the door behind you.
References: 臺北市政府消防局(民105)。臺北防災 立即 go(英文版) page 75。台北市：臺北市政府消防局。