Mark 14:63

Then the high priest Caiaphas had now gained his end. The Accused had spoken. He had criminated Himself. All was uproar and confusion. The high-priest rent his linen robes. This was not lawful for him to do in cases of mourning (Leviticus 10:6; Leviticus 21:10), but was allowable in cases of blasphemy (see 2 Kings 18:37). It was to be performed standing, and so that the rent was to be from the neck straight downwards. The use of the plural "his clothes," by St Mark, seems to intimate that he tore all his clothes, except that which was next his body.