Redditor bluebull62 fits perfectly in his great-grandfather's uniform from World War I. He (the great-grandfather) served in France as a mechanic and test pilot, meaning he repaired and flew airplanes made of sticks and fabric. Bluebull62's grandfather is 82 and wanted to see him model the uniform before he goes into a nursing home. You can see from the side-by-side pictures that it would take him back to the memory of his own father.
He also posted a few other pictures in a gallery, including one with the overcoat and hat. Bluebull62's great-grandfather on the other side of the family was in the Navy during World War II. Will he also go into the military? That remains to be seen -he's only 17 years old now.