The mod that most reminds me of Immersive Armors is http://tesalliance.org/forums/index.php?/files/file/1318-wac-waalx-animals-creatures/ I use it as much for the clothing and armor and weapons additions as I do for the creatures. WAC is almost like having Immersive Armors, Immersive Weapons and Skyrim Immersive Creatures all rolled up together. I think WAC armor and clothing has that same creative mash-up feel that IA has. You may not be interested in having extra creatures, though.