I suggest you give
Lou at Foxwear a call. He makes custom tailored clothing for hiking/biking and I'll bet he can fix you up. I have his products (pants, shirts, shocks) and just find them to be outstanding in every possible way from fit, construction and workmanship all at a price that does not break the bank. I would be surprised if he couldn't make exactly what you are wanting.
Disclaimer: I am in no way associated for Lou or his Foxwear clothing. I'm just a very happy and satisfied customer who likes to support the little guy when I can. If you search here you will find many of the very same comments of Lou and his Foxwear clothes.
fasthair