Not sure if this has been brought up before, I went back a month or so in the forum. Also: this is not about adding cosmetic slots to our avatar so we can have the stats of one piece of armor but show another (like the disguise slot), although this suggestion would tie in with such a system.
What is ostensibly missing from crafting is clothing, i.e. anything other than armor. Roleplayers now have to choose between going around in their work clothes or go naked. I'd like to see recipes for all manner of clothing: formal male and female attire from simple to ornate, various workman's clothes, rags, shirts, skirts, kilts, hose, you name it. These could be added as rare recipe or item drops, unlock at various crafting levels, or earned by questing, or a combination. Much of this clothing already exists on NPCs, and it wouldn't take a rocket scientist to add this to the crafting system we already have. Tweaking the rarity means players of any stripe have an interest in gaining these items or recipes, since they can sell them on if they do not care for such items themselves.