No club shall have the right to make changes in its club colors

and/or in the designs of its team helmets or uniforms except in

accordance with the following provisions:

(1) Absent specific extenuating circumstances as determined by

the Commissioner, if a club desires to make any changes in club colors, uniform appearance, designs of team helmets,

designs of team uniforms, trademarks, or trade names, it must give written notice and details thereof to the League on or

before March 1 of the year prior to the year in which it wishes to change; must comply with the uniform change notification and approval timeline as established by the League office and

amended from time to time; and further must obtain approval from the League pursuant to Section 19.9(D)(2) by December 1 of the year prior to the year in which it wishes to change; otherwise it shall have no right to make any change for the succeeding season.

[Emphasis added]

https://www.onlabor.org/wp-content/uploads/2017/04/co_.pdf