This code is already in the game when you play RTTS or offline etc you can select your different uniforms you want to play in.
For DD they need to expand the custom uniforms to a home , road and at minimum a single alternate the before each game give the option to customize uniforms selection no different than what already exists in other areas of this game or games like madden and ncaa football.
Having 3 uniforms that can be mixed and matched seems like a no brainer updated.