By buying the DLC in the game or by buying the pre-order edition,da vinci disappearance editon
you had to have preordered the game from Best Buy.
You cannot
You have to fight a lot of monsters and other things to get the armor. you have to find the peices to the brotherhood armor.
To repair your Brotherhood armor, you need T51-B Armor, or an additional set of Brotherhood armor. So you probably used your T51-B Armor to repair it, depleting it.
Yes there is.
Go to your hideout and equip the desired armor
by killing an brotherhood outcast npc.
Hammerfell clothes.
Get the DaVinchi dissapearence and you should get it
Unfortunately (because it looks awesome) no.
Drachen Fire was created in 1992.