All that being said, the WWII gear isn't all that comfortable
The WWII gear is absolutely miserable!
I went through Basic and Advanced Infantry Training at Fort Polk, LA, and Officer Candidate School at Fort Sill, OK with that stuff.
First of all, you hook suspenders to the ammo belt, then buckle the pack to the suspenders. But you can't get it tight enough. With every step, the straps slip a little, and the pack eventually comes unbuckled if you don't keep pulling on the straps.
The horseshoe roll (blanket, poles, rope and stakes rolled up into shelter half) sticks out beyond your shoulders, so you have to force the rifle in there somewhere, and it keeps slipping off your shoulder.
And the elbows in charge in those days believed that
too much water caused heat cramps and heat exhaustion.
So you marched, pulling on the pack straps, re-seating the rifle, and following a pitcher of cold beer that floated about a foot in front of your face, mile after mile after mile.