FIFA fully respects the significance of commemorating Remembrance Day on 11 November each year.
The Laws of the Game are overseen by the International Football Association Board (composed of the four British FAs and FIFA) and applicable to all 211 member associations. The relevant Law 4, para. 4, clearly states that the players equipment should not carry any political, religious or commercial messages.
The Laws are applied uniformly in the event of similar requests by any member association to commemorate similar historic events.