grab it from kro? i try check from zackdreaver github he doesnt have it https://raw.githubusercontent.com/zackdreaver/rAitemDB/master/item_db.txt
if anyone want it this is the script
31186,C_Black_Cat,Costume Black Cat,4,0,,0,,,,0,0xFFFFFFFF,63,2,2048,,1,1,1582,{},{},{}
download the .grf from here
rAthena.grf and put it in your client