uniform
n. C / Un. a special set of clothes that all members of a group wear. You wear this so people can easily see which school, team, or job you belong to.
n. a distinctive set of clothing worn by members of a specific organisation or group while participating in that group's activities.
The students must wear a blue uniform to school.
The airline requires all cabin crew members to keep their uniform clean and professional during every flight.
While the military uniform serves a practical purpose in the field, its primary function during the parade is to project a sense of absolute discipline and unity.
Borrowed from Middle French uniforme, from Latin uniformis.
Countable when referring to the specific set of clothes; uncountable when referring to the general concept of wearing such clothing.