"I always wonder what kind of beanpole could possibly have a 36" waist and 34" inside leg."

Me!.... 6'1"....(although 33" is better, they are harder to find.) That is nothing...when I was about 18-19, I was 6'1" with a 26" waist.135 lbs.
Try finding 26" X 34" jeans! My mother spent years taking in most of my trousers! I didn't gain weight until I was just past 30. Now 165lbs.