Question regarding covert infiltration and Christopher odds S9 playlist

I’m very confused as to how to customize my soldiers. It seems that with covert infiltration, the way your soldiers look is directly tied to the armor that’s currently equipped

Is there a way to equip the armor I want but customize it to look like another?

I’m using ODDs s9 playlist plus the s9 cosmetic playlist. I also added super soldiers and Jedi amalgamation classes. When I equip the mjolnir armor (or any armor btw), it switches my appearance. Not only that but the customization options for mjolnir, for example, is so limited. I CANNOT access any of the Spartan armor mods I have installed. I can only select the vanilla armors(basic to powered)

Then when it comes to the uniform manager, I feel like I need a PHD to use the damn thing. Who designed this interface? Am I missing something? I spent like 2 hours yesterday trying to figure out the damn thing. I’m gonna need someone to hold my hand and explain the uniform manager to me like I’m 5 because I feel like the secret is in there