Clerical clothing
Clerical clothing is non-liturgical clothing worn exclusively by clergy. It is distinct from vestments in that it is not reserved specifically for services. Practices vary: is sometimes worn under vestments, and sometimes as the everyday clothing or street wear of a priest, minister, or other clergy member. In some cases, it can be similar or identical to the habit of a monk or nun.
In modern times, many Christian clergy have adopted the use of a clergy with a clerical collar.
Eastern Christianity
In Eastern Orthodoxy and Eastern Catholicism, a useful distinction between liturgical vestments and clerical clothing is that vestments are required to be blessed before being worn. Conversely, clerical clothing is not, and is regarded as daily wear.
Inner Cassock: The inner cassock (more commonly, simply Cassock) is a floor length garment, usually black, worn by all clergy members, monastics, and seminarians.
Outer Cassock: Called a Ryasa (Russian: ряса) or Exorason, the outer cassock is a large, flowing garment worn over the inner cassock by bishops, priests, deacons, and monastics.
