BloodFlame saidI have to agree... Either try to get some custom fitted pants or try some womens jeans/pants because they do indeed stretch.
I just want to reiterate that, if you want jeans "that stretch" like women's jeans, just go to any denim maker (APC comes to mind immediately but I'm sure at this point many cheaper denim companies also would suffice) and search for jeans with 2-3% elastin in the composition.
It should be pointed out however, that to real denim heads, you are not "buying jeans" if they have elastin in them. Another option is to go for the whole dry/raw/selvedge denim route. Denim, as a material, stretches quite a bit if you have the patience and pain tolerance to "break it in". Again, APC and tons of other jean manufactures make jeans with raw denim.
Either option should work. With the raw denim the cut might be a bit more important, but they will end up stretching to fit your body as long as the sizing is close.
No matter how big your thighs are, I have a hard time believing you would look better in a pair of jeans cut to fit a woman's body.