Exact same. Found my best fitting trousers which happened to be from an older pair of suit trousers. Ordered chinos to keep initial investment low, tweaking where needed (slimmed out a bit since they are chinos and not suit pants, etc).
Actually mine ended up being a combination of multiple pants--rise from one, thigh from another, etc. Hence the spreadsheet to keep it all straight.
Really, about the same as my shirt ordering process.