Seems like both Osiris and Cyrus got dressed up for the occasion.
Fun fact: Pre-comic Cyrus's design included the triangular pattern on the gold parts of the tunic. When I began making the comic, I intentionally chose to remove it from his design because I thought it would be difficult to draw and color consistently. I think that was the right choice, but I've always wanted to bring it back. An outfit change for the finale seems like the perfect time!