The term 'commercial attire' refers to the type of clothing that is appropriate for a professional setting. The crossword solution for this term is 'DRESS, ' which is a seven-letter word. DRESS is a broad term that can refer to a variety of clothing styles, but in a professional setting it typically means a more formal style of clothing such as a suit or DRESS shirt and trousers. Commercial attire is usually expected to be neat, clean, and conservative in color and style.