Reusing gear models has been a thing for a really long time now. The i380 crafted gear is literally just the Doma Castle gear.

Archaeoskin crafting/gathering gear? Just the i70 Hussar set with a different colour and function. i133 crafted gear is just the i100 gear from Wanderer's Palace and Keeper of the Lake with a new colour and being meldable. Even the i90 crafted combat gear is just a colour swap version of the stuff from Brayflox normal.