Lets begin with Intro to Lapels 101. There are three major sections you need to know.
Marked in red is the actual lapel area, this shape changes depending on the style of lapel.
The break point is marked in yellow. This is the point where the lapel begins to fold or break to create the lapel from the center front.
I have heard several people describe a notched lapel as looking like a step from the collar to lapel. Sure that works, but I think the easiest way to point out a notched lapel is to imagine the shape of a bird with their mouth open.
Who am I kidding? I have to include the ladies too. How beautiful is this extremely peaked lapel by Alexander McQueen?
A shawl collar brings out a more casual feel. Its origin is on a smoking jacket. Hugh Hefner popularized this style of collar/lapel as he was typically seen lounging around in a smoking jacket.
Written by Sheila Wong Studios