Other forms: lapels
A lapel is the front part of a jacket or suit coat that's folded back. Your jacket's lapel is connected to your collar.
Fancy or dressy men's clothing tends to have lapels — the tuxedo you wear to your uncle's wedding might have a satin lapel, for example. The suits that businessmen (and often women) wear also have lapels. Lapels come in different shapes and widths, although they almost always have a buttonhole on the left side, originally intended for wearing a flower. These days only prom- and wedding-goers tend to stick a flower in their lapel.