I set out to make the most common sort of pair of denim work pants of the 1880s into the 90s as I could figure. A lot of fabric sold as "denim" these days is too light weight or not the right weave at all. I was able to locate a bit of denim that was, indeed, a heavy cotton drill and a good dark indigo dye.
I've found Past Patterns #014 to be a good base for mid to light 19th Century trousers. I cross referenced with the table on page 86 of Jason MacLochlainn's The Victorian Tailor of common trouser knee and cuff dimensions in the late 19th Century. I copied the back belt from a pair of extant jodhpurs in my collection.
Amy helped me out pinning the break in the front in back. Incorporated a number of tricks of late 19th Century trouser making I have learned over the years with well reinforced seems. They have proven excellent work pants. Been wearing them quite a bit day to day.
The Victorian Man