Please consider instead introducing simply the re-sale / purchase of an entire set (already crafted beforehand).
I, personally would prefer that: i could then normally craft each individual piece of the set and then offer the whole set for re-sale with a single click.
That would be convenient for both the crafter and for the purchaser, and would make less likely that the purchaser miss out on one or another part of the set due to some other buyer snapping it up beforehand. The purchase would simply not take place if the buyer's inventory would be overburdened by the completed purchase.
I, personally would prefer that: i could then normally craft each individual piece of the set and then offer the whole set for re-sale with a single click.
That would be convenient for both the crafter and for the purchaser, and would make less likely that the purchaser miss out on one or another part of the set due to some other buyer snapping it up beforehand. The purchase would simply not take place if the buyer's inventory would be overburdened by the completed purchase.