My favourite fictional belt is the …
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Girdle of Melian
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Girdle of Aphrodite
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Girdle of Hyppolita
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Orion's belt
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Belt of Ozma
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Batman's utility belt
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Ring of Kafrene
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Other (please comment)
Btw, didn't a doctor somewhere in the Space Odyssey series have a medical tool belt of holding? It's been a while since I've read that.
Update: changed poll question and added answers suggested by Happy-the-monk and Arunbear. Keep suggesting more. Question was: “My favourite mythical magical girdle is the …”
Update 2017-08-07: added the ring of Kafrene (from Star Wars: Rogue One).