Okay, support for the trench coat was added to RPGx - I'm just waiting for the Blockland Glass moderators to review the update. Make sure to download
0.4.0Beta once approved, as it includes the scripts and GUI for the coat's storage system. To access the coat's inventory, just set / use a keybind to open the Personal Inventory GUI. This is what the inventory looks like - let me know if you need it to be changed in any way:

Also, make sure to add the following code to the coat's ItemData datablock:
isRPGx_MblStorage = true;
RPGx_MblStorType = "CoatInv";
RPGx_MblStorGroup = "Coat";
RPGx_MblStorParInv = "RPGxPar_CoatInv";
isRPGx_SmCont = true;
RPGx_itemName = "Trench Coat";
RPGx_dontStack = true;
RPGx_usesUniqueID = true;
Edit: 0.4.0Beta of RPGx has been approved.
https://leopard.hosting/download.php?f=losas
its pretty much done, colors might need to be adjusted but thats an easy fix. it also needs an icon but idk how to do them properly
I could add an icon, but I'm having issues with the download for some reason.