Point Collar
A button-less shirt collar with points aiming straight down at the
ground and coming together in a point. You would use a
tie with a small knot.
Button-down Collar
A shirt collar held in place by buttons fastening through the collar
at the point the collar attaches to the body of the
shirt. Preferably you would not use this shirt with a
dress suit. This shirt tends to give a suit a more
casual look. Point or spread collar would be better
for a suit.
Spread Collar
A dress shirt collar with points spreading out from the neck at
45-degree angles and leaving a wide area for a tie.