A couple thoughts and improvements that could be done to enhance the game:

1. Allow crafting of arrows (and bolts in DG) I know they are readily available but still. something like 10 per ingot.

2. Alowing total cloths changes to your spouse after marriage, not available to once strickly NPC characters. Followers can be changed to better quality armor looks but if you want to give your spouse fine cloths to wear, there is no option or they will not wear it.

Those are in game the moment Dawnguard is loaded.
You need firewood and the appropriate ingots to make them.
10 per 1 firewoord and 1 ingot.

What ya have there is those invisible clothes which are set up in the CK NPC editor under inventory.
Specifically the small clothing box not the main inventory box in NPC Inventory Tab.

Only way to remove those in game is by deletion by itemID in the console or selecting them in it and using a removeallitems command.
If they respawn or resurrect, those would reappear.

Best fix may be a new scripted spell, maybe called Emperor's New Clothes, which runs the command "removeallitems" or "removeallitems ContainerRef" on the npc, probably restricted to "factions" which allow one access to inventory., i.e. Followers and Married partners.

thats good to know about DG and ammo creation, but I am playing skyrim on Xbox so do not have the ability to do those type of commands, but wil lhave to check under settings to see if there is some kind of option for that.