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Yeah, Johnny. They really weren't worn in the Golden Age of Piracy -- not by seamen at least. Bucket boots are a horseman's thing, and you don't really see people walking about in them. Not in the Golden Age of Piracy in any case. 100 years earlier, yeah. But not in this period.
They're sexy and cool. But they're Hollywood. 100%
As Rue said, there's a whole 24 page thread on the topic. It's not a rant or a flame far. There's actually a lot of good information in it. So if you want to know the true and full answer to your question, go here.