Camouflage Question for E-100

Ok so started playing my E-100 again and was looking at camo and saw the Clear Skys Hero Skin for 2000 Gold, this caught my attention right away. Now the question i have is i see it's available on all 4 Camo environment types, if i buy it for 2000 for one can I apply it to all 4 or do I need to buy it 4 times for all 4 environment?