In the 1963 film, there is several 'Dolphin-Boy' toogles. Below is a good example of one.
Flipper's New Adventure (Movie) - 1964
Flipper TV Series - 1964–1967
Throughout the entire TV Series of Flipper, the main boy actor is always in a state of semi nakedness - typically from the waist up. When the boy actor is not semi-naked, he is usually wearing either a red/white top or t-shirt or solid red top.
Flipper The Movie - 1996