Requirements
1) Large amount of time

2) Patience Level 999999.........

3) BCS Data knowledge
BY Mugenattack = animegamemods.freeforums.net/thread/670/bcs-file-understanding-data-completed

4) Some Knowledge to understand xml files format

5) Genser tool from eternity = animegamemods.freeforums.net/thread/701/tools-eternity

6) Some Knowledge for idb edit from my tutorial = animegamemods.freeforums.net/thread/902/explaining-idb-data-setup-adding (it's wip state whole data soon available )


Now I taking example with HUM.BCS
drag hum.bcs to genser.exe then you get HUM.bcs.xml

Now We get started open generated new file

and Like these So I want to add costume like 300 which contains 4 costume parts and with 3 lod files then find <PartSet idx="300"> and copy code like these 



Paste at bottom and change model and model2  value= "new value " and change 
Like these  Here I added new Id 941 and 942 
Paste Data down here like these Here I change  <PartSet idx="new value "> and  <MODEL value="new value" />

<MODEL2 value="new value" />



starting should like these


Ending Should Like these



And after all click on save and drag your edited hum.bcs.xml to genser.exe If you delete your bcs from genser folder it's will make new or if you din't then it's append new data in your any chara .bcs

That's it for now costume 4 parts like TOP,BOTTOM,SHOES,GLOVES for accessories it's will new data soon available



I hope that's will help you to make new costume slot new id for cac && or costume pack mod of main characters

Result
Download Link = xenoversemods.com/mods/new-entry-added-cloth-in-bcs-for-humansaiyan/