I am missing armor from previous Solstice events on my characters. My Hunter has everything, my Titan is missing all of the Season of Arrivals armor, and Warlock is missing an entire page of solstice gear (doesn't list Arrivals gear at all, even as missing).
I know for an absolute fact that I obtained and upgraded the armors for all of my characters because I ALWAYS do all of Solstice, so I'm wondering why they're missing. In fact, I kept them all in my vault until right before Witch Queen when I deleted them when cleaning my vault in preparation, since they were sunset anyway.
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Are you maybe thinking of the Opulence sets? Season of Arrivals gear was never sunset. Bungie stopped sunsetting gear after season 13 (Season of the Chosen) meaning gear after season 9 (Season of Dawn) was never power capped.