During the E3 coverage the Layered Armor system was mentioned. I paused the video at that moment. I know its early and that there was only the vault jumpsuit.
Hopefully the clothing underneath the armor pieces are not SET one piece outfits. Like if you find some awesome pants You have to deal with the shirt since its attached.
The Vanilla Raider armors of Fallout 3 are a favorite of mine. The raiders had shirts/jackets etc on under their armor.
I know info is still kept tight right now but.
Hopefully you can sort of have the Raider style armors or Craft something similar in Fallout 4. Of if shirts underneath are optional.
One piece shirts and pants combos have always felt Forced. "Oh you think that jacket is wicked but you hate the pants Oh well deal with it. It's a one piece clothing set."