Old Navy and Gap make a Loose Fit or Baggy Fit jeans that is fitted in the waist and ankle but looser through the hip and thigh.
Levis 550s and 560s (if you can still find them) are also a loose fit jean.
Dockers and Lees khakis were very comfortable for me during my trip - fit very well in the waist but again looser through the hip, thigh, and calf!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"