There are many items with a yellow star. Those items are particulairy.
Unfortunatly, not all items with a yellow star are to buy anymore. (The users who has made are inactive for a long time or are even frozen).
My idear is to start a poll which items with a yellow star are popular enough to make it official.
For example: I really want those items become official in the Cash Shop or in the Custom wearable shop. Saggitarius Ungulate Butt Red Fox Companion
I suppose it's only possible with a poll.
I don't see how this could ever work out. People who make CWs expect them to not be real items forever. I think if some were made into real items, it could upset many people who now own the cw or who have made the cw.
This would cause so much unnecessary drama. There's a ton of entitlement around 'private' custom wearables, for any of these to become official items would make a lot of people angry. Even if there was a poll, what if the item's creator was to say no? To ignore their wishes and make their item official would be pretty rude.
People pay with real money or sP that's converted into CSC for the privilege of having these items made. Official items like the two mentioned in the OP are already available. Another option is to commission more CWs like the inaccessible ones. This is a very shortsighted suggestion that ignores basically all the effort that goes into creating custom wearables.

Is there a legitimate reason outside "But I want it and there are none for sale QnQ" to do this?
No support and I doubt Subeta would ever agree to this. It's a train wreck waiting to happen.
Yeah, this isn't gonna happen. The buyer's made those items for a reason, for them to be exclusive. If they didn't want them to then they would just put them as unlimited in the cash shop.
What about we respect copyright to the artists unless stated otherwise? These items were created by someone, not Subeta. Albeit they are Subeta's, they are still created by someone else. If the items are capped, that's how it works. It would cause a lot of drama and make a lot of people angry.
The logic is: If you want them, buy them. Private? Buy the sole public copy. No public copy? Well, we can't always have everything.
I'd pay millions to watch all the drama and chaos, oh my god that would be so funny
Dude. Private items. Items with limited batches.
... lol no.

Dude. Private items. Items with limited batches.
... lol no.

lmao no???? they're custom wears & they should stay user controlled for that reason