Its easier than you think. All you need

[snow mango]

but i need mine to fit the metahuman rig (and skeleton mesh that goes with it) perfectly

basically.. I've been thinking I'd rather find and buy an asset that does it rather than rigging it myself.. hence why i was asking you if it worked with the mh rig

[stuck basin]

If you just attach it to the same rig you are using from for example blender they will work together.

Like with the armor here https://www.youtube.com/watch?v=w3NC-I-1fQg

At 5 mins he shows how you can make one mesh follow another. The reason I dont want to do this for my armor is that my armor might need to be attached to different skeletal rigs

[snow mango]

yeah I've attached static meshes to bones before but this is different.. two skeletal meshes need to behave in the same way to the same rig as they are overlapping

ooohh i see the arm armor seems rigged

and in that sense, even the helmet uses the rig

[stuck basin]

yea so both are rigged to the same rig in blender and then exported sepperate. Essentially both have the same rig when you import each of them and one can follow the other.