Very Long time neede are the Manaquins, Armor Stands, time to put some work on them

And it doesn't look right. What most people want, including myself, is something like this:

 

Personally, I think that it would be wonderful to have a Mannequin tied to a vendor.
That way, when you select a clothing/armor/weapon/wearable item in the vendors list, you can click a button in the Vendor UI to put the item on the mannequin to see what it looks like.
Then there's a button to clear the mannequin to start over and try different items.
Buy the item(s), and the equipment is removed from the mannequin if it's equipped, and put into your inventory.

Of course, you could have other mannequins around the store equipped by the owner as display only. But only one mannequin max would be tied to a vendor for trying things on there.

 

Just make things in the store sellable. Otherwise you have to have two copies of anything you want to display.