Collar Style

The collar style of a man’s shirt can change the appearance of the whole
outfit.  A button down collar is more casual than a spread collar,
but a tie can certainly be worn with a button down.  There
are several styles of spread collars, and this is purely a personal
choice.   You can find different collar styles in off the rack
shirts, but there is a wider choice in custom shirts.

Hidden Button Down, Button Down

Narrow Spread, Moderate Spread

Wide Spread, British Spread

Rounded

Rounded