He told Blaine, Burt, and Finn that he made his own prom outfit. That's the only time I can think of though. But you're right, it's probably significant that he usually talks about getting bargains or doesn't explain it at all.
Does the hippo head brooch have a particular meaning other than "Kurt is super stylish right now"?
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Does the hippo head brooch have a particular meaning other than "Kurt is super stylish right now"?