Every "Required" on this site, and where it comes from.

IFAB Laws of the Game, Law 5 (The Referee), section 5: Referee's equipment

Compulsory equipment. Referees must have the following equipment: whistle(s); watch(es); red and yellow cards; notebook (or other means of keeping a record of the match).

Applies to: The referee, in matches played under the IFAB Laws of the Game. This section covers the referee only, so the assistant referee list shows these items as common kit. Your competition or association may add uniform rules of its own.

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USA Hockey Official Playing Rules, Rule 501(c) Appointment of Officials (2021-25 edition text)

All On-Ice Officials shall wear black trousers and an official sweater with the current USA Hockey officiating crest on the left chest of the sweater during all games. ... Each official is required to wear a black hockey helmet, with chin strap properly fastened, and a non-altered half-shield visor properly attached to their helmets.

Applies to: USA Hockey sanctioned games (2021-25 text; the 2025-29 rulebook adds a neck laceration protector for on-ice officials under 18). High school, college and other governing bodies set their own rules.

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USA Hockey 2025-29 rule change summary, Rule 501(c)

Adds new rule requiring all on-ice officials under 18 years of age to wear a neck laceration protector.

Applies to: USA Hockey sanctioned games, officials under 18. Officials 18 and over: recommended, not required.

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Care labels

FTC, "Clothes Captioning: Complying with the Care Labeling Rule" (16 CFR Part 423). Used on Sizing & care.