We ride, too. What clothes, exactly, were found?
That's a press picture of him, but he's wearing an appropriate armored jacket and armored pants.
I agree, commonly we leave helmet & folded gloves, often the jacket at the parked motorcycle.
Not the pants, folks, not the pants. He is likely an All The Gear, All The Time rider, values his skin & bones & body, and is serious about protective clothing.
He probably didn't hike, or walk every far. The boots & pants are designed & fitted for riding position, not for walking. But, you usually have to take the boots off first to take off the armored pants (usually sized to wear over jeans or other pants) so yeah that doesn't happen for a quick walk.
Mr. Johnson described icy roads to his fellow rider. He is likely wearing long underwear, with wind protection on the front.
He has a couple changes of clothes in the motorcycle's luggage. Also tools, and water.
Heated gear, does anyone know??? We don't own a Honda, is the CB1000R set up for it?
He described himself as "wiped." Fighting wind & icy roads and sometimes darkness is exhausting. When the sun is shining, the black clothing can be hot. Yes, even if the road is icy. Was he trying to get a drink in the stream, out of water bottles?
Did he ride with a Camelback, Ms. Trop would know.
So many questions....