From the Super Mario Wiki
Swipin' Stus resemble the Winged Strollin' Stus, except they are larger and have green pants instead of blue. Their pants also travel over the Stu's head, similar to a hoodie. If the player looks closely, they will also see that it has darker skin than a typical Strollin' Stu. Swipin' Stus attack when Mario walks beneath them, attempting to land on him. If a Swipin' Stu succeeds, it will steal the Mario Cap, and spontaneously grow a mustache similar to Mario's. Without his cap, Mario will slowly lose health. To retrieve his cap, Mario must either Ground Pound the Swipin' Stu's and take it back, or re-enter Pinna Park for the game to reset its position.
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