How do I get these costumes for my companions?
Solution 1:
You can download mods now on Xbox one for Fallout 4 (and Skyrim Remastered).
You will need a Bethesda.net account to log in first before you can download mods.
Some of the mods you are looking are probably found here
Here is an Iron Man outfit
A Batman Battle Armor
Mass effect 3 N7 armor
Always becarefull when downloading mods and combining mods. Effects may be unpredictable, untested and potentially unsafe and may cause your game to crash.