The first time I visited Washington Cascades, in 1974, I spent three weeks in the region camping. Seeing photos of lots of ice, I brought a mid-weight down jacket with hood, and a sleeping bag with 2-2.5 pounds of (cheap) down.

Lugging all that stuff around was a mistake derived from my lack of experience, that significantly degraded my fun. In roughly 2 dozen return trips, I left that stuff at home.

Summer in Cascades isn't particularly cold as it turns out. On a clear night at 5,000 feet, it might touch freezing at times, but more often not. The summer weather is typically very stable, and dry, although there are exceptions. Weather forecasts are typically very accurate.

Rather than "too general," the list I linked to was specific and detailed. What I actually wrote about was "clothing for torso" which is also highly specific. I don't think I implied that one ought to go barefoot or neglect other body parts.