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JKS is a popular brand of fashion from Fish-Man Island.
In SBS 79 Oda explained it is a fairly new brand and even made its way onto Dressrosa. The shirts are brand with text that describe the situation such as "RIKUOUSAMADA" (IT'SKINGRIKU), "JANAINO?!" (IT'S NOT?!), "RYOUKAI!" (ROGER!) and "IKINOBIRU!!" (IWILLSURVIVE!!). Oda encouraged readers to look for them as he was sure there was a bunch more to find.
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