A surplice or cotta is traditionally worn over an altar server cassock. Both are white liturgical garments, although they differ in length and design. Some churches may use a surplice with wide sleeves, while others prefer a shorter cotta. The appropriate outer garment depends on the church’s tradition. Servers should follow the established vesture practice of their parish or liturgical community.

A cassock is a full-length garment worn as the foundation of traditional altar-server attire, while a cotta is a short white liturgical garment generally worn over it. The cotta is typically shorter and less full than a traditional surplice. In many churches, a cassock and cotta are paired to create formal altar-server clothing. Exact terminology and styles can vary between denominations and individual churches.

An altar server cassock should generally extend close to the ankles while remaining safely above the floor to prevent tripping. The exact finished length depends on the wearer’s height, age, footwear, and the church’s preferred style. For children, sufficient length should be provided for growth without creating a safety issue. Holy Clergy recommends measuring from the appropriate shoulder or neck reference point to the desired hem.

An altar server cassock should fit comfortably without being excessively tight or loose. The shoulders should allow natural movement, the sleeves should provide appropriate wrist coverage, and the hem should remain safely above the floor. Children may need additional room for growth, while adult servers may prefer a more tailored fit. The cassock should also accommodate comfortable movement during kneeling, walking, sitting, and serving.

To measure an altar server for a cassock, take measurements for chest, waist, shoulder width, sleeve length, and overall garment length. Measure while the server stands naturally and wears the type of clothing normally worn underneath. Keep the measuring tape level and comfortably loose. For children, consider reasonable growth allowance. Holy Clergy recommends using actual body measurements rather than relying only on age or standard clothing sizes.