Odd number arcs drop armor. Even number arcs drop weapons and jewelry. If you've collected all armor pieces across all class sets, you'll start getting duplicates. Same is true on even arcs if you've collected all weapons and jewelry. Curation in IA doesn't switch over from armor to jewelry (or vice versa) within their respective arcs.
i have my main house (grand topal hideaway) listed in the housing tours, it has multiple target dummies, scribing altar, and grandmaster stations (fully filled out with current game), as well as almost every antiquity furnishing on display to preview them
in progress: acquiring mundus stones (currently only have the thief)