Any organization of the active militia may, with the approval of the Commanding General, and at its own expense, adopt any other uniform than that issued to it; but such uniform shall not be worn when such organization is on duty under the orders of the Commanding General except by his permission.
D.C. Code § 49-212
Distinctive uniforms
Mar. 1, 1889, 25 Stat. 777, ch. 328, § 37; renumbered Feb. 18, 1909, 35 Stat. 634, ch. 146, § 40
Official source: D.C. Law Library (Council of the District of Columbia). Reproduced from public-domain District of Columbia statutes; confirm against the official source for the current text. Not legal advice.