Absolutely. Anything that reduces your detection range makes stealing easier. The Deaths Wind set has a 3 piece bonus that reduces your sneak detection range. And, the Medium Armor passives help too.
My NB wearing 3 pieces of Deaths Wind and the Medium Armor passives can pretty much ignore line of sight and steal with out a care in the world. Right next to the NPC.
And, Invisibility Potions can get you the same thing.