5 U.S.C. § 5901: Uniform allowances

furnish to each of these employees a uniform at a cost not to exceed $400 a year (or such higher maximum amount as the Office of Personnel Management may establish under section 5902); or pay to each of these employees an allowance for a uniform not to exceed $400 a year (or such higher maximum amount as the Office of Personnel Management may establish under section 5902). When the furnishing of a uniform or the payment of a uniform allowance is authorized under another statute or regulation existing on September 1, 1954 , the head of the agency concerned may continue the furnishing of the uniform or the payment of the uniform allowance under that statute or regulation, but in that event a uniform may not be furnished or allowance paid under this section. An allowance paid under this section is not wages within the meaning of section 409 of title 42 or chapters 21 and 24 of title 26.