Here's a possibility to consider:
http://www.bohn-armor-pants.com/catalog/
Wear your favorite owned pants/trousers/slacks or jeans over them.
The Key here is to pick a pair that are just a little big on you, so the Bohn's fit you comfortably underneath.
You can even layer pants (it's warmer that way) such as this: thermal underwear, then bohn pants, then pants of your choice

Pretty cool huh?
Store bought cycle pants? I find "Rev'it" pants a good fit. I first call the website (my choice was Revzilla customer svc.), I reveal my measurements (to a stranger? Yep

) & then get spot on help in the fitting for this body.
gse123, I did read that you picked a pair of trousers from the link you shared above. Good luck if you ordered them. They seem protective from where I sit and fairly priced. Stay warm pcx'er. WN