So you really like to, Alright there is have mod for character changing skins, The mod is ChangeSkin-Multiplayer and linking is: [ https://github.com/05126619z/ChangeSkin-Multiplayer ]
Just i make you sure know about the download from right point is.
I suppose download from [v2.2.1.gv5.1_mp] That will be better.
If you want to know how to changing your character skins, I have recorded can show you, The linking is: [ https://medal.tv/games/casualties-unknown/clips/mafhp1Iyn2Acwm0Zb?invite=cr-MSxT... ]
By the way, The mod was by [@Todd "CEO" Howard] From Discord.
So have a enjoy.