Applying Clothing on a Toolbox borrowed viewmodel

[clever parrot]

Im basically only just starting to make a new game fps shooter, im trying to figure out how can i make the viewmodel which is just a toolbox free viewmodel that i rigged into each weapon and its the set viewmodel used basically im just trying to find any way i could put the clothing of the players avatar and also the skin color, or if theres any other better way to do it, i also worked tried making it work but the decal of the clothes wrapped around it for some reason instead of the clothing let me know if theres any way to fix thanks!

[neon harness]

you can add a humanoid into the viewmodel aswell as name the parts "Right Arm" and "Left Arm"
and after that you can add the players shirt into the viewmodel