The long, white robe is called an alb. The alb is intended to cover the pastor, to hide his personal clothing, and in a sense to mask his personality. This helps the worshippers to focus not on the person, but on his office. The pastor serves as a representative of Christ. He proclaims a message that is not from him, but from God. The white color of the alb also serves as a visual reminder that all believers are covered in the pure righteousness of Jesus Christ.
