The armor would be a special forces equivalent of power armor and basically act like a full outfit that you would get fitted for at a stealth armor station it would not quite a frame but it would be compatible with jumpsuit like underclothes
The suit would have a decent armor value but would have several inbuilt perks affecting the speed at which you run and sneak by a significant degree it would be sleek and form fitting using either a compact mower armor system or a biological system based of fov the suit could also be a Chinese counterpart to power armor like the Chinese stealth armor
Having a speed/ stealth alternative to power armor would be fun
Mod schematics could be acquired through quests as rewards
Mods would
like greatly improved sneak,sneak speed,run speed,sprint speed,augmented jumping,and maybe a dash ability for legs
Sneak attack damage , enemy marking , weak point detection,night vision, and water breathing for head
Arms would have faster melee attack speed, increased melee damage,increased unarmed/martial arts? ,faster reloading,vats accuracy increase, recoil control,and decreased vats cost, grapple hook?
Torso would have Chem injector, silenced jetpack? , inbuilt stealth boy , improved sneak, decreased action point cost for sprinting, additional armor
One aspect to add would be armor model types instead of models I would think about a ballistic weave like the railroad has
Material mods might just be shadowed , faction paint, and maybe some kind of fiber perk that has a muffled effect
Maybe a cosmetic option to change helmet and such
Tell me what you think , pitch it to Bethesda , or add your own idea
This is kind of my ultimate wish for fallout 4 I would love to see it happen, if someone knows wherever the [censored] it is that Bethesda takes suggestions please post this idea there