Coronation Dress sounds so…weird.
I prefer Coronation Gown because it gives it some elegance. Imo.
Sorry to turn this into a debate, but I do not really like this as a costume.
(Well, I like it, but I do not think it would fit.)
When Elsa sang Let it Go, she rejected all that made her queen. she threw away her Tiara, her gloves, and replaced her Coronation Gown with the Icy ensemble selected for the game. This was to demonstrate that she was not afraid to use her powers and that she didn’t care what people thought. Adding this Dress, seems to negate that ideal. Especially if the gloves are added too.