I have a question and wonder if anyone can answer, I'd honestly test this myself, but seeing as how I wont be able to play Skyrim for the rest of the night, I was hoping while I sleep, someone could answer for me who already knows by testing it.

I have the assassins outfit which gives me +20% bow damage, but I also picked up the Leather Bracers of Major Archery which also gives me a buff of 25% Bow damage, so my question is, if I equip both Items One giving 20% and another 25%, will my bow get a 45% boost to damage?

I would be interested in knowing this too.

feather or whatever its called now stacks if you put it on multiple pieces of armor, havent tried anything else yet tho.

So we should assume that yes they do stack if feather does?

Yes, gear bonuses stack.

Potions do not.

I had multiple smithing improvement enchants on different items, when I wore one I could get my armors / weapons up to exquisite when I wore the other two I could take them up to legendary.