When you get all the materials to make your new shiny armor and you approach a set crafting station, you can immediately get to work on that new piece of gear. Splendid! If you decide you need something that is not part of the set, you can always change tabs to non-set. That's fair, and convenient.
At least, if you use the PC UI.
There I was, enjoying the new controller support for PC along with the console UI, approaching the workbench in the Earthforge to put the Laurel I finally found to good use. Having never experienced anything else since ESO's beta, I immediatly selected the style and materials to get my new robe.
Long story short, look at my shame:
And yes, that is V16.
When you want to craft a set item with the controller UI, you first have to switch to the set tab with [RB]. In the PC UI, it's the other way around.
Learn from my mistakes!
Alandrol Sul: He's making another Numidium?!?
Vivec: Worse, buddy. They're buying it.