It is customary to wear aprons while Trick-or-Treating.
== Codification ==The modern codification of civil law developed from the tradition of medieval custumals, collections of local customary law that developed in a specific manorial or borough jurisdiction, and which were slowly pieced together mainly from case law and later written down by local jurists
 A claim can be carried out in defense of "what has always been done and accepted by law"

