If wedded to the Spoon/leaning-forward riding style then look for jeans with a gusset?
As richard says, swrve jeans do/did(?) so-called ‘cycling jeans’
2011 review here
Added benefit of denim is it traps and holds rain-water seemingly forever. I cycle-commuted to work in denim jeans for the best part of 5 years, and saw/kept a lot of rain in that time. Rather than be seen dead in lycra (or, for some obscure reason known only to no-one never thought to get changed at work)
Denim is also cold in the wet n windy, and sweaty in the sun. Though for short dry, autumnal rides to a pub – denim is perfect. No-one in a pub wants to smell wet, sweaty lycra. And if they do, you’re possibly in the wrong pub.
These Karrimor stretchy outdoor trews seem to fare better in wind, and dry more quickly after rain. Still prefer long swim-shorts and gusseted long-johns under. What would be really good would be dungarees with elasticated ankle and a gusset. Made from some wonder-fabric that is wind- resistant, water-resistant and hard-wearing