Zwar wasn't able to provide evidence of purchase but insisted they did purchase it at some points.
And since you're confirming it was double sold, I'd say you're unable to sell the set but you're allowed to wear it. But it seems as though you're already aware of that. Thanks for cooperating.
Meanwhile, I'll see if i can get to the bottom of this.
Turns out, Slime had sold the set to both of you. There's no record of that specific set on discord #market or the forum Market boards. Zwar was unfortunately unable to provide evidence of purchase but said he's renouncing ownership of the set. This doesn't help because Slime may have sold the set to more people.
Skeez, the initial statement stands. You're unfortunately unable to sell the set (but you are allowed to wear it) if you could private message me the screenshots of DMs or whatever evidence you're able to provide.