The term 'priestly vestment' refers to the garments worn by priests during religious ceremonies. The two crossword solutions for this term are 'amice' (5 letters) and 'ALB' (3 letters). An amice is a white linen or cotton cloth that is worn around the neck and shoulders of a priest, while an ALB is a long, white robe that covers the entire body. Both garments are typically worn during Mass and other liturgical ceremonies.