Armor and skins

So I’ve seen that some armor has skins that exclusive to that set of armor or at least that’s what I got out of what I have seen. But are there only certain skins for each armor set or can I use any skin on any armor set?

the cretain skin only goes with that armor for example gungir has pulse skin

Skins are specific for that armor.

One skin for each armour set. So if I had the forest skin for Hazop, I can only use it for Hazop. But I don’t know how they would do this for the LEGS and ARMS. Maybe the LEGS and ARMS can have any skin on them.