Short Sleeve Cocktail Dress What Do You Call A Cocktail Dress That Has Like A White Shirt Or Top Under??

What do you call a cocktail dress that has like a white shirt or top under?? - short sleeve cocktail dress

was in the old style, when they usually cocktail dresses tube and then compared with a white envelope "short" from top to bottom. I believe that we designed for types of conservatives who are not willing or do not want that skin to show their weapons, but elegant, modern look ... PLEASE HELP! :-)