That's already part of the game.
I forget exactly where its at however you can select any zone and get a matrix in real time of every piece of every set that you know for that zone.
No mod required. I believe its in the same area as collections just a different icon over on the right I want to say.
The item itself tells you if it is "collected" or "not collected". Should be right next to the bound status where it says "bound", "bind on pickup" or "bind on equip". Selling to NPCs I think does add it to your collection, same as deconstructing, but selling to another player obviously doesn't add it to your collection as the item needs to become bound for that to happen.
That's already part of the game.
I forget exactly where its at however you can select any zone and get a matrix in real time of every piece of every set that you know for that zone.
No mod required. I believe its in the same area as collections just a different icon over on the right I want to say.
That is true, but not what I want. I'd like to know when I look at the item if I've already collected it, not to memorize all items I have and look them up in a separate list.
+1 for this.Set Collection Marker
https://www.esoui.com/downloads/info2804-SetCollectionMarker.html

That's already part of the game.
I forget exactly where its at however you can select any zone and get a matrix in real time of every piece of every set that you know for that zone.
No mod required. I believe its in the same area as collections just a different icon over on the right I want to say.
That is true, but not what I want. I'd like to know when I look at the item if I've already collected it, not to memorize all items I have and look them up in a separate list.
I don't think anyone said anything about expecting you or anyone else to memorize whether you have it or not. I certainly did not say that when trying to help you out so I'm not sure what that even means.
Furthermore, on my game I don't have anything (that I've noticed) that tells me the info you're looking for.

That's already part of the game.
I forget exactly where its at however you can select any zone and get a matrix in real time of every piece of every set that you know for that zone.
No mod required. I believe its in the same area as collections just a different icon over on the right I want to say.
That is true, but not what I want. I'd like to know when I look at the item if I've already collected it, not to memorize all items I have and look them up in a separate list.
I don't think anyone said anything about expecting you or anyone else to memorize whether you have it or not. I certainly did not say that when trying to help you out so I'm not sure what that even means.
Furthermore, on my game I don't have anything (that I've noticed) that tells me the info you're looking for.
I certainly don't have time to inspect everything, I keep things as simple as possible and let the game do that for me. Then I view the report later on. Like I would think if you're trying to make sure you have a complete set or see what pieces you're missing from a set, wouldn't it make more sense to look at what you have already?
It just sounds like you're going about this the hard way, which ZOS already added something to use for this purpose anyways. I just don't see the need for an extra mod when the thing you need is already in the game. Just something else to troubleshoot especially with other issues the game has sometimes.
+1 for this.Set Collection Marker
https://www.esoui.com/downloads/info2804-SetCollectionMarker.html
It adds a green symbol next to "uncollected" items in inventory.
I'm not aware of too many things, but I know what I know, if you know what I mean.
https://m.youtube.com/watch?v=tDl3bdE3YQA