Malaysian Men Style Faux Pas #1 - Suit / blazer button rules

Taken from Wikipedia:
A faux pas (/ˌfoʊˈpɑː/ plural: faux pas /ˌfoʊˈpɑːz/) is a socially awkward or tactless act, especially one that violates accepted social norms, standard customs, or the rules of etiquette.

The expression faux pas comes from French, where it means "false step", "misstep" (in a physical as well as a figurative sense). It has been used in English for over 300 years.Synonyms in English include gaffe and (social) blunder.

Two buttons ONLY on a paddock cut suit jacket

I have been to many events where Emcees, celebrities, guests and other people use too many buttons on their single breasted jacket (will talk about double breasted jackets later). The most common is buttoning the lowest button on one's suit jacket or blazer. I have seen so many. Too many in fact.  This is a no-no. Unless you are wearing a 1920s style paddock coat where, if it were a two button jacket, both buttons are way above the waist, place closed together and where the cloth then falls away AFTER the button, not after the top button (note photo above). I doubt most This graphic from realmenrealstyle.com at the top of this posting easily tells you which button to use.

And of course, it is also proper that the jacket stays buttoned when you are standing, walking (I doubt people would care or you would care if you were running). Unbutton the jacket when you are seated so that you are more comfortable.