Actually there is a procedure for putting on a flashood, you should be putting it on your head first then put your jacket on so the at the long part that comes down to your shoulders actually is covered in by the jacket. You then roll the bit that sits on your head back so that it sits on the top of the back of the jacket.
I've probably made it sound more difficult than it is but I trained our guys in the procedure in about 15 mins, the video runs about 10 mins and then we had slides with the correct procedures and washing and handling instructions.