The national team must wear pants that are not part of one of the two official kits.
The Selection Spain play their group stage matches Seen Costa Rica, Germany and Japan all dressed in red and not with the clothing that was officially presented together with Adidas for the 2022 World Cup in Qatar.
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Why the Spanish national team will play its World Cup matches in Qatar 2022 with red shorts and what the original kit and shirt looked like
Spain plays its matches in the group stage of the 2022 Qatar World Cup with red pants Costa Rica, Germany and Japan also wear dark pants. Spain made the small mistake of it present two uniforms with blue pants. Yes, one darker than the other, but the same color, which means it has to vary and the group stage matches have to be played with different pants, in this case red.
As reported by Relevo, Adidas was not happy with the decision.
Source: Goal