I'd rather not use the term 'khaki' unless referring to a color, because it is so misused and confusing. Khaki is a color, not a fabric, much less a kind of pants. I'd rather call them all chinos because that's what their signature twill fabric is called, and then make a distinction between 'casual' chinos and 'dress' chinos based on the characteristics mentioned above.
'Dress pants' doesn't hint at the fabric being used, but most of the time it's a plain weave or basket weave cotton, not chinos. And when they are actually chinos, people would call them 'khaki' regardless of the color. Weird.