23.—(1) An unconvicted prisoner may wear clothing of his own if and in so far as it is suitable, tidy and clean, and shall be permitted to arrange for the supply to him from outside prison of sufficient clean clothing:
Provided that, subject to rule 40(3):
he may be required, if and for so long as there are reasonable grounds to believe that there is a serious risk of his attempting to escape, to wear items of clothing which are distinctive by virtue of being specially marked or coloured or both; and
he may be required, if and for so long as the Secretary of State is of the opinion that he would, if he escaped, be highly dangerous to the public or the police or the security of the State, to wear clothing provided under this rule.
(2) Subject to paragraph (1) above, the provisions of this rule shall apply to an unconvicted prisoner as to a convicted prisoner.
(3) A convicted prisoner shall be provided with clothing adequate for warmth and health in accordance with a scale approved by the Secretary of State.
(4) The clothing provided under this rule shall include suitable protective clothing for use at work, where this is needed.
(5) Subject to rule 40(3), a convicted prisoner shall wear clothing provided under this rule and no other, except on the directions of the Secretary of State or as a privilege under rule 8.
(6) A prisoner may be provided, where necessary, with suitable and adequate clothing on his release.