Where can I find my ancestral tunic?

Hint 1 of 7:

It's located in the museum on Citadel Island.

Hint 2 of 7:

Try walking in there and taking it.

Hint 3 of 7:

It appears the door to the room that controls the security system is locked.

Hint 4 of 7:

But don't worry -- there's another way in there.

Hint 5 of 7:

That room is located on the second story of the building.

Hint 6 of 7:

And the walkways on the island go that high as well.