User blog comment:Commander Marko/Who's the prettiest of them all?/@comment-8802138-20140630141501/@comment-3974211-20140702165002

@Feirund - Classic mermaids are 50% fish and 50% human. Nami is 80% fish, 10% face and 10% boob window. Perhaps they were trying to make her look modest given that she's an infant (so they covered her entire upper body with scales and fins), but the fact they left in a boob window which draws attention to her cleavage makes it fan service.