This skin was taken from the files of the Nuketown 1886 map which you can find at the link below. I saw this and thought, "maybe other people would like to use this skin".
To install, place the 3 IWI files in C:\Users\XXXX\AppData\Local\Plutonium\storage\t4\raw\images
NOTE: I did not make this...I simply took it from the files of a custom map because I thought people would like to use it. DO NOT GIVE ME ANY CREDIT