I'm looking for something like a pair of knee breeches, but tier out somewhat like this. Essentially like those in the 18th/19th century, but more volume.
Inspiration includes
Dont laugh at the pictures, that's all I could find .Yes I'm quite serious
If all else fails I may have to try and make something myself...
I guess you're really going to have to get them online, unless you spend years searching golf shops. Making them, or getting a tailor to make them, is probably the way to get exactly what you want.