The billionaire, his brother and several others who gathered to celebrate after Blue Origin's historic manned launch on the New Shepard were seen wearing cowboy hats near the launch and landing site in West Texas.
Live video footage of the launch and landing captured Bezos wearing his hat prior to takeoff and then putting it back on before exiting Blue Origin's crewed capsule after it touched down on Earth before 10 a.m. EST.
A number of social media users poked fun at the Amazon founder's fashion choice after Tuesday's landing.
Tuesday's launch marked Blue Origin's first manned flight into space and the second historic space mission this month after Virgin Galactic's founder Richard Branson successfully completed his flight.
Blue Origin's crewed capsule reached a maximum altitude of 351,210 feet before returning to Earth.
The crew – consisting of Bezos; his brother, Mark Bezos; 18-year-old Oliver Daemen; and 82-year-old "Mercury 13" aerospace pioneer Wally Funk – and personnel celebrated with champagne Tuesday morning after the triumph.