How to modify dlc packs for this i'll use the example of Bugsy's Ravishing Rick Rude mod pack (ALWAYS REMEMBER TO BACK UP YOUR FILES BEFORE TRYING THIS!!!)
1) Use Lefluffie and Extract the catalog_hd.arc file from the official dlc (DLC 5 for Rude)
2) Update the PAC file/add additional attires to the catalog_hd.arc using Xpacker
***If adding new attire, you will have to edit your misc01_start.pac as well to prevent the game from crashing***
3) Use Lefluffie and Replace not inject your CH