罗马衫是绝大多数西方基督教神职人员/教牧人员衣着的一部分，为衬衣上的一个可拆式衣领，由二个饰钮——一个在衬衣前和一个在后紧固着。衣领在脖子后面缝合，呈现无缝合线的前线。其中可拆卸领扣在汉语中被称为“罗马领”，有时也被称为“狗项圈”，为白色的，所以绝大多数的罗马衫以黑色为主，起到修饰白色作用。虽然罗马领在17世纪被发明，但是衬衫的衣领设计却是一个相当现代的发明（可拆式衣领应该在1827年被发明）。英国圣公会报告，当时神职人员习惯佩带一个由牧师Donald McLeod博士发明的可拆式衣领(援引格拉斯哥先驱报，1894年12月6日)，并且通过牛津运动变得普遍。在一些左派教会里，则很多看不到罗马衫的出现，因为衣领被认为和天主教会联系在一起。

A clerical collar is an item of Christian clerical clothing. It is a detachable collar that buttons onto a clergy shirt, being fastened by two metal studs, one attached at the front and one at the back to hold the collar to the shirt. The collar closes at the back of the neck, presenting a seamless front. It is almost always white and was originally made of cotton or linen but is now frequently made of plastic. Sometimes it is attached with a "collaret" or "collarino" that covers the white collar almost completely, except for the top edge and a small white square at the base of the throat, to mimic the collar of a cassock. The clerical shirt is usually black (or another color appropriate to a person's ministry rank), with a detachable tab of white in the front. When clergy are delivering sermons, they sometimes attach preaching bands to their clerical collar.