For your top half, basically what others have said - hike in whatever you need to stay warm and layer up with a down jacket and wind/waterproof layer on the outside when you stop.
For bottoms, I like the MH Compressor Pants when needed. They have full side zips and reinforced knees/butt. Mine weight about 19oz
I can't imagine what that Cabelas suit must weigh. Judging by their other stuff, it's probably really heavy.
