Hello,
I have one squad with 9 riflemen, I put a helmet and pants on all of them for Moscow campaign, but when I switch to Stalingrad or Berlin campaign for the same soldier, I cannot use the same helmet and pants. The identical helmet cosmetic is available in all campaigns, as well as the pants.
I should not have to buy another helmet in order for the same soldier to use it when he randomly gets put into Stalingrad or Berlin.