The term 'Certain Collars and Jackets' can be summarized as ETONS, a five-letter word. ETONS are a type of formal clothing, typically worn by men, that consists of a jacket and a high-collared shirt. The shirt is usually white and the jacket is usually black or navy blue. The style originated in England in the 19th century and is still popular today. It is often seen at formal events such as weddings and other special occasions.