The best Grand Nagus costume has to be this one. Grand Nagus Zek was loved, envied, and feared by his fellow Ferengi with good reason: He was both genius and crazy. Nowhere is that more apparent than in his wardrobe. Some of the fabrics used seem like an absolutely crazy choice, but they come together with pure genius and this Ferengi costume is a prime example.
This is the best Grand Nagus costume, and I am so very thrilled to own it (thanks Steve, it's in good hands).