gownlike
Gownlike is an adjective used to describe something that resembles or has the characteristics of a gown. A gown is typically a long, formal dress, often worn on special occasions. Therefore, an object or garment described as gownlike would share qualities such as its length, flowing nature, or an air of formality.
For instance, a coat might be described as gownlike if it is exceptionally long and drapes gracefully.