Not sure if this has been suggested before, but I couldn't find it. So.
When I use quick stock to put things in my wardrobe, it's usually after vending/questing a lot, and I want to make sure I save any wearables I don't already have. I quick stock, the next page shows me a big list of items that weren't moved. My suggestion is, instead of showing what WASN'T moved into my wardrobe, show me what WAS. I think it makes sense to see what new items were added, rather than telling me the ones I already had in there/aren't wearables. And maybe even display how many items are in my wardrobe after the new ones were added (for anyone who, like me, is constantly working towards the wardrobe size achievements). And this might make sense for quick stocking to the armory as well.

I don't mind how the wardrobe quick stocks as it is. The old wardrobe has the recently added tab and the beta wardrobe puts them in that order as a default.
A counter is not a bad idea but it seems server intensive to me. I think looking in that part of Achievements is fine.

Counting shouldn't be server intensive, and it has to be done every time someone loads the achievements page anyway. But that was more of an afterthought really.
I just feel like showing what wasn't added gives us less useful information than showing what was. I don't know, maybe for other people this is useful, but I never bother to look at it, and I'd much rather see what was added. And I have to go to Wardrobe > Clothes > Recently added, whereas if they were displayed after adding them I don't have to do any extra work. I know it sounds lazy not wanting to click 3 times xD But this just feels like better information to display.

this feature already exists in both the New and Old Wardrobe. Look at the dropdown box that says "new items". All the items you added recently are shown, in add order.
If you want to know what they were, just look at them.
I don't think this is really needed - I like knowing what doesn't go in just because sometimes I expect an item to be added and then wonder why it wasnt. And Thats when you can find out items don't work or aren't ready for the wardrobe.
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I kind of wish this could be something we could switch back and forth. It'd be much more useful to me to see what was added without having to go into the wardrobe every time. I understand it showing items that weren't added, but 99% of the time I don't bother looking through it.