If you`re struggling to get jeans to a particular fit, you can get them custom made to your required measurements at https://www.makeyourownjeans.com/. They’ve got a good selection of fabrics, and I can recommend getting a gusset put in to significantly extend the life of the jeans.
I’m a satisfied customer but have no other affiliation with them.
I initially read that last sentence as “Hope his prostate collapses sooner than later.” and honestly couldn’t find a reason to disagree.