Business Wear
Buttons are buckled, waists, matching trousers, or trousers-style slacks. For light-colored polo shirts, they will be “bottomed”. This is quite a gentle way of dressing, suitable for business and formal occasions.
Casual Wear
General POLO shirt will have 2-3 buttons, close-fitting, you can buckle the bottom of the button, one or two of the above, with casual trousers.