Mario's overalls in the Paper Mario series are blue. The color matches his familiar classic outfit: a red cap and shirt, blue overalls, brown shoes, and white gloves.
Paper Mario turns Mario into a two-dimensional paper character, but it keeps his recognizable visual identity intact. The original Paper Mario began development as Super Mario RPG 2 before its paper-like art direction evolved into the distinctive cutout style used by the finished game.
The blue overalls are easy to confuse with other colors because the series uses bright, simplified graphics and sometimes changes the color balance of Mario's clothing depending on lighting, backgrounds, or artwork. Yellow is especially associated with his buttons, while red belongs to his shirt and cap.
The first Paper Mario was released for Nintendo 64 in 2000 in Japan and internationally in 2001. Its visual approach became one of the defining features of a series that blends role-playing, adventure, puzzles, and comedic storytelling.