“He shall put on the holy linen coat, and he shall have the linen breeches upon his flesh, and shall be girded with a linen girdle, and with the linen mitre shall he be attired: these are holy garments; therefore shall he wash his flesh in water, and so put them on.”
King James Version (KJV)
16:4 The linen coat - It is observable, the high - priest did not now use his peculiar and glorious robes, but only his linen garments, which were common to him with the ordinary priests. The reason whereof was, because this was not a day of feasting and rejoicing, but of mourning and humiliation, at which times people were to lay aside their ornaments. These are holy - Because appropriated to an holy and religious use.