<P> Among the Eastern Orthodox Church and Eastern Catholic Churches a band collarette with no "notch" in front may be worn by seminarians, although the norm is still a standard clerical collar . However, as the cassock is more commonly, if not mandatorily, worn to classes, often a plain white shirt will suffice, or a band collar with no collarette . Slavic cassocks button to the side, and thus a collar is often pointless, whereas a Greek cassock buttons to the front and has a higher collar, so the collar prevents chafing--as was its original function under a cassock . Eastern deacons and sometimes subdeacons, but rarely readers or clerics, also wear a clerical collar, with subdeacons and readers often having a style with no notch, or a tab shirt with no tab . Most Orthodox clerics do not wear a clerical collar; those who do are usually to be found in Western Europe or North America </P> <P> Collars are typically worn by clergy of other groups such as those of the Anglican, Methodist, Presbyterian and Lutheran traditions, although many Scandinavian Lutheran clergy wear the ruff instead . Also many Pentecostal and non-denominational Christian, and others wear collars . In the Roman Catholic tradition, major seminarians, after receiving admission to candidacy (and thus becoming "candidates" for ordination), often wear clericals in the seminary and / or in their dioceses . </P> <P> In the United Kingdom (and other British - influenced countries, such as Canada), clerical collars have been informally referred to as "dog collars" since the mid-nineteenth century . The term Roman collar is equivalent to "clerical collar" and does not necessarily mean that the wearer is Roman Catholic . </P> <P> During the 1950s the Reverend Alec Vidler began to advocate the abolition of the clerical collar in favour of a black shirt and white tie, but whilst some clergy adopted this mode of dress it did not become widespread . </P>

When do vicars have to wear dog collars