Why does Loyalist carry items not sold?

NPCs never sell their worn equipped.

Why does NPC wear clothes??!??

Where is this you have to sell things you carry rule? I missed that one.

To stay warm ?

An unwritten rule.

Is the unwritten rule written? Or is it an unwritten unwritten rule?

Depends upon the circumstances and degree of urgency.

The Loyalist merchants' weapons and shields are ornaments available in the DB Marketplace. If you hail one, they will tell you that, too.

As Alerynril the Loyal herself says:

'I know not from whence these funds arrive to this world, but there is a [marketplace] that will offer you goods for those funds. Some of it is so interesting I am wielding some of it. You can ask me what I am [holding] in my right hand or you can ask me what [shield] I am wearing.'

You used to be able to change their clothes by giving them armor - used to see red-plate-wearing NPCs, where they had been given mage-summoned plate

Dressing the Priest of Discord used to be a 'right of passage' for new mages as they would get the summoned armor.

" DB Marketplace " not correct.
I did forget about the hail, I never hail that npc. But it is not sold in the DB Marketplace as you see in the picture.

A lot of them have been but are unfortunately not right now, I always check marketplace for a chance that guktan or rune forged are put back on for a few days, I believe the last time was summer of 2021 that bow was on there