I think I've got my math right, so a costume that costs 5850 credits is...
US $38.96 buying the least amount of credits and
US $33.90 buying a hundred dollars worth of credits.
Seriously? (rhetorical question)
Are there REALLY that many whales to support these ridiculously over-priced virtual outfits? Of course I've seen a few of these around, but the servers are so underpopulated I really don't know what's going on at the business strategy meetings to justify this price.
And don't get me started about this game having credits instead of a solid real world price for things. We know what a rip-off that is. A person ends up spending FAR more than they think they're spending, so those prices I've listed above are only if you use exactly the credits in your account.