We have the option to unequip all weapons from a soldier, so I thought it would be a good idea to also allow unequipping all customization of soldiers in all eras (Moscow, Berlin, Pacific, etc) in the customization menu so we do not have to search which unused squad still has the nice helmet I once used.
EDIT: By all eras I meant unequiping it for all eras with the same button, not each era separately.