From US Soccer:
IFAB ANNUAL BUSINESS MEETING – DECISIONS AND DIRECTIVES
The International Football Association Board (IFAB) has completed its evaluation of how to implement its decision to allow headscarves to be worn under certain conditions.
As this is a temporary measure and subject to change based on reported experiences, it is not at this time being made part of the Laws of the Game, but FIFA has issued a directive with the following guidelines which are in effect immediately.
Law 4 – The Players’ Equipment
The headscarf must
- be of the same color as the jersey
- be in keeping with the professional appearance of the player’s equipment
- not be attached to the jersey
- not pose any danger to the player wearing it or any other player (e.g., opening/closing mechanism around neck)
- only be worn by female players
U.S. Soccer’s Advice to Referees
- The phrase “same color as the jersey” can be expanded to mean the same main color as the jersey
- The inspection for safety of any headscarf should be focused on the objective of allowing the scarf to be worn unless it is clearly unsafe and cannot be made safe
- This language confirms that male players cannot wear headscarves under any circumstances