If the item was needed to finish a quest, they shouldn't let you sell the item. Or there should be a way to retrieve said item. And nobody carries the armor.
Its because if they made it a quest item then its stuck in your inventory, thats not good since armor carries weight, as for making it weightless that would just be over powered for those that play thieves. I still have the full set something told me I should keep it
I have the same problem. To all the people who asks, "Why did you sell it?". WHO CARES! If it was required for a quest to complete, you shouldn't be able to sell it. That's just stupid that you could sell it. Yes, I sold it. It is a BUG! It is a STUPID bug. Why would I keep it if I did need it? It offered me nothing. I played the entire thieves quest wearing heavy dragon armor. So why would I need to keep it. This needs to be fixed.
Hate to say it but its not a bug, its called cause and effect. its not hard to just store it in your house, thats what I did. You dont sell off an outfit given to you buy a guild, who knows if youll need it have it on hand later, I did the same thing with Stormcloak garb.