The part of a coat or jacket that is folded back on the front.
Lapels are often seen as a formal or professional part of clothing.
Examples:
He pinned a flower to his lapel.
Her coat had a big lapel.
The lapel of his jacket was red.
The lapel of my coat is bigger than the lapel of your coat.
The lapel of his jacket was so big, it could fit a whole sandwich.
She always wears a pin on her lapel.