Attire for clergy is handed down from a tradition that began all the way back to ancient Roman times. Uniformity in attire is good for identifying purposes, like:
- all cops wear blue uniforms, and
- all doctors wear white.
Latin rite Catholic bishops and priests cannot marry, and hence cannot have sexual relations, since sex is exclusive for marriage according to God's law. Priests that do have sexual relations are objectively sinning, and must repent and sacramentally confess like everybody else.