I am trying to create a summoning mod for my own personal use only. I want to have the summoned npcs be wearing armor from other mods such as Immersive armors. So far I have only been able to equip the summoned npcs with vanilla armor, how do I get the armor from other mods integrated into my mod. I tried opening both mods up in the creation kit at the same time but that does not seem to work. I'd appreciate any help. Also, it goes without saying I have no intention in taking any credit for the awesome work actual skilled modders have done, I simply want thier work to be easily displayed in my game

You're missing a step.

You gotta use TES5EDIT for that. Via override as new record, or possibly the other option. I forget.

Then you can do the rest in the CK.