The term 'official garment' can refer to three different items: a VESTMENT (8 letters), a UNIFORM (7 letters), and a ROBE (4 letters). A VESTMENT is a type of clothing worn by members of the clergy, such as priests or bishops. A UNIFORM is a type of clothing worn by members of a particular organization, such as a school or military unit. A ROBE is a type of loose-fitting outer garment, usually worn for formal occasions. All three of these garments are considered official garments, and are often associated with authority or power.