Just gonna chip in here,
I think having them on toggle for the player would be nice, to add some diversity between players, or even different regiments in matches. This could also be expanded on for other uniform accessories and customization, so you can distinguish different community regiments in games. So say I make a regiment, everyone in my regiment would have the same variation of uniform (knapsack, hat and what not) so each regiment can have its own look. I think it would be cool.