It seperated armor pieces into different parts so you could place them on the character individually. So you might make yourself an armor that had the leather armor body and legs but you could then equip the spaulders and ammo belt from the Armored Vault Suit seperately. It was very impressive but I can't find the link for it on the Nexus site anymore to show. I was just wondering would something like that mod be even possible with Skyrim when a CK is released?
Edit: Found the link on the New Vegas Nexus. http://www.newvegasnexus.com/downloads/file.php?id=36660