The term 'PART OF MEN'S BUSINESS ATTIRE' can be summarized as a NECKTIE, which is a seven-letter word. Neckties are a type of clothing accessory that is typically worn by men in formal or professional settings. They are usually made of silk, cotton, or synthetic fabrics and come in a variety of colors, patterns, and styles. Neckties are often seen as a symbol of power and status, and are an essential part of men's business attire.