My suggestion is to allow mission designer to decide if they want players to wear enemy uniforms or not. I suggest to add it in form of scripting command so mission designer can control it in any way they want. This rule should not affect enemy AI and they still should spot and engage enemy players regardless of their uniform (behavior change can be implemented through scripting on mission side)
enable: Boolean - allow usage of enemy uniforms
This option is set to false by default as it is now in alpha.