A "notch collar" is a type of collar design commonly found in suits, jackets, and blazers. It refers to a collar that has a small triangular indentation, or notch, where the collar meets the lapel on both sides. Full definition
Complete with a narrow notch collar, an appearance of a two pocket front flap detail, and four velvet buttons residing on the bottom of each sleeve. (sophieandtrey.com)
This faux - leather jacket has a sweet side with pearl - embellished shoulders, but it's still plenty tough with a traditional notch collar and belt. (bestproducts.com)
Double breasted, fitted jacket with notched collar, and half belt in the back. (1stdibs.com)