Make sure your at least level 25 before trying this. Try looking for Mauraders, I would
suggest Fort Allesia near the Imperial City, Mauraders will usually have Deadric and
Orcish armor if you are at a high level, the higher the level, the better your chances.

Hope I could help
Peace

im at lv 16 and i do loops around the imperial city and i kill bandits and they drop
orcish.