"Cannot Use that Class" message????

[gadzi_h]

A number of the set wouldn't work, as some items will be part of multiple sets. (Consider an accessory that boosts craftsmanship, for instance. If your crafting classes are near enough the same level to all use it, it's likely to be part of eight different gear sets, one for each crafting class.)

Good point. Then even an information window showing all sets the gear belongs to could work. Something like the information windows that pop-up for items, or skills in the hot bar / cross bar. But regardless a mark needs to be there. I was just making gear sets on my PC after switching away from PS3 and ran into the issue you are talking about needing to equip multiple crafts with the same gear. It's just a small quality of life change but it would make things so much easier.