Would you like to ask the fireman why he can't wear a fire coat in the fire engine?
When a car is crowded, more than 10 people in the two row don't have the chance to get a fireman to change it with his clothes. If you think about it, bring the clothes to go, the car can not change, to the scene to start changing clothes, people will not drop!
Fire clothing is not your ordinary clothes, more complex, you need a certain space for wear
