What a fabulous photo!
We can see the string around his right thigh above the knee, this holds his pistol holster close to his leg so that when he draws his sidearm, it comes out of the holster easily .Without it, if you pull the pistol, the holster bunches up and the gun gets "stuck."
The flag has 48 stars, 6 rows of 8 as Hawaii and Alaska were not yet states.
Trivia question for everyone: without looking, how many rows of stars does the current (50 star) American flag have?