Mass. Gen. Laws ch. 40 § 6B
A city or town which accepts or has accepted this section may appropriate money for the purchase of uniforms for members of its police and fire departments and its shellfish constabulary, which may include the purchase of rubber boots, shoes, and other outer clothing necessary for the use of members of the police and fire departments and shellfish constabulary when traveling to or from or during the course of their employment.
A city or town which appropriates money for uniforms for the uniformed members of its police force may appropriate money to be paid as a clothing allowance to an officer serving as a detective or required to work without a uniform; provided, that the sum so paid as a clothing allowance to a member, serving as a detective or required to work without a uniform, shall not in any event exceed any maximum amount established by a city or town as the amount that may be expended by the city or town during a given year, for uniform clothing, for a uniformed member of said force under the provisions of this section.
Mass. Gen. Laws ch. 40, § 6B