If you have the Path of Darkness mod in Oblivion, look for Tybor Black, then the armour is in a stone coffin, underwater, in cheydinhal. Look near the bridge next to the chapel.
its ebony and u have to find it
you find it in random treasure or in some armor shops at i think lvl 6-7 and up.
basically on bandits in ayleid ruins or in bandit camps. If you need to find anything go to Oblivion Wiki or Elder Scrolls wiki.
To get Saurons armor in oblivion you must first download a mod or create one that imorts the armor in the game. Then depending on which mod you have installed ofr the armor you can find it in different places. See the related link listed below. Where to find it in-game is probably in the description or the images. Or, if you have the construction set, just load the mod with the cs and find the armor in there; expand the second column to get the form id's for the pieces of armor, and when in-game, just press '~' and type: player.additem <form id> <quantity>
Inside the Hall of Despair on the last level, in the top drawer of the bedside table.
if you have oblivion on the PC you can type in the cheats menu coc testinghall here you will find rooms with every weapon, armours and other cool stuff.
if you are looking for dwarven armor there is a mission in the biggining of the game where you travel to fort sundercliff and the bandits should drop dwarven armor. i think you have to download fort sundercliff but dont worry its free
if you mean the dark brotherhood armor kill someone then sleep until you get invited into the family
All you have to do is level up, (to about level 30 or higher) then go out in to the forests and the bandits might where glass armor, or even deadric once you are a high enough level.
As you level up you will find that rare armor starts to appear in the game on bandits and other humanoids The higher your level, the more you will start to find and the more it appears. First is dwarven, next is elven, and so on. I will advise you to aim for better armor though, such as dadric armor or glass armor.
The assassin's creed armor for oblivion is just a mod. you can go to google and search "oblivion mods." it's a pretty popular mod, so it should be pretty easy to find. Nope. You can't get mods for the 360, sorry. Get a PC. PC's can run mods however 360's cannot.
Sorry, but I don't think stores sell armor like that. But you can find it in many places on a level of 15+.