The park seems to have had trouble with this character. In the photos I've seen they never seem to get it right. Here (above) the character has a boxy face and shark eyes. I admit that it's kinda' funny, but....he's not the animated Disney Hook. No way.
So far as I know, the Hook costume likeness that came closest to the one in the animated film was a Halloween mask by the famous mask maker, Don Post. I have one of those (above), and it looks great.
Another character the studio had trouble with seems to have been Minnie Mouse. Here she is looking like a dog (above). She's standing beside Pluto who actually is a dog but who looks more like a chicken here.
Actually these costumes are probably the Ice Capades costumes that Walt borrowed for the opening of Disneyland. Poor Walt. He doesn't look very happy with what he's seeing.
Here's Mickey and Minnie from an earlier Disney era, before Disneyland. It was common for licensed dolls and costumes of the day to look horrific and amateurish. That's odd because because that period coincided with the Golden Age of American illustration.
HAW! These costumes (above) are from 1931 and probably weren't designed by the studio. They look like some kind of bondage outfit filtered through a Silent Hill sensibility.
This story has a happy ending, though. Eventually most of the costumes (above) were done right.
Maybe somebody thought the old costumes were too scary for kids. I doubt that kids felt that way. I'll bet they loved them.