What is the difference between a gown and a dress?

The answer

A gown usually refers to a formal, floor-length dress worn for elegant evening events, while dress is the general term for a one-piece garment of any length or formality. Black tie events typically call for a gown or an equally elegant outfit, whereas cocktail attire usually calls for a knee-length or midi dress. Shops may use the terms loosely, so check the length and description.