Although the trousers of the present-day uniform of the United States Navy are still referred to as "bell-bottomed", they simply have large straight legs. The wearer's thigh fills the upper trouser leg, making the bottom of the pants leg appear flared. This style has been popular for many years, perhaps originally because the trouser leg can be rolled up easily, allowing the wearer to work in bare feet, but there is no reliable documentation that confirms a specific timeline or reason for the popularity of bell-bottomed trousers in naval apparel.