By skin you mean each part of the outfit of your player ? You will have to use different natives

GET_PED_PROP_INDEX(Ped ped, int componentId)
GET_PED_PROP_TEXTURE_INDEX(Ped ped, int componentId)
GET_PED_DRAWABLE_VARIATION(Ped ped, int componentId)
GET_PED_TEXTURE_VARIATION(Ped ped, int componentId)

You may find this link helpful : https://wiki.■■■■■.net/index.php?title=Character_Components (that’s for GTMP so they don’t code the same way but you can find every component and prop id)