[LeroyII]

pawn Код:

public OnPlayerRequestSpawn(playerid)
{
    if(GetPlayerSkin(playerid) == SKINID && (PlayerInfo[playerid][Vip] < 1)) //replace SKINID with id of skin you want and 1 with vip level
    {
        SendClientMessage(playerid, COLOR_RED, "This skin is for VIP use only!");
        return 0;
    }
    return 1;
}

Something like that.. You will maybe have to change thing or two but it should be simple for you if you succeded to create system