Final answer:
The correct order to describe the noun “gown” is “a long violet silk gown”, with adjectives placed before the noun.
Step-by-step explanation:
To properly describe the noun “gown” in the phrase “a long violet silk gown”, the words should be ordered to place descriptive adjectives before the noun they are qualifying. The order of adjectives in English typically follows a specific sequence: opinion, size, age, shape, color, origin, material, purpose. Here, “long” describes size, “violet” describes color, and “silk” describes material. Therefore, the correctly ordered phrase is “a long violet silk gown”.