The Saigon equivalent of a dreich day, it was overcast and cloudy all day with near constant drizzle gave me lots of time to mull over the rainwear solution.
I've more or less given up on working out how to get the plastic poncho to keep anything other than my shoulders slightly dry. They flap around and leak and whatever I'm wearing on my legs wicks up water to waist height. I put it on when I'm on the bike but it's more a case of fitting in that providing any practical wet weather protection. How two Vietnamese manage to stay snug and dry under one of them is beyond my comprehension.