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Thanks for the replies, Guys.
The local dive center suggested that in the month of August, we should use 5mm at least because it gets colder around that time.
Well it's a suggestion tho, I believe vary for everyone. But one thing for sure is that I need extra layer than others as I can't stand too much cold. So at least I better add something to my body... e.g. vest
-kebo
I wear mine under my suit, especially since it fits closer to my body and is thinner than the suit, it helps to fill the voids in the suit and is much warmer, noticeably so.
The biggest difference in heat retention is the addition of the hood. Your brain is the last thing the body restricts circulation to, mostly when your heart stops beating, thus it is pouring your body heat into the cold water, a total loss.
N