I recall reading somewhere that the term "chinos" is what the English (and maybe Europeans) call what Americans typically call "khakis". I use the term interchangeably although I prefer chinos because with khakis, I'm never sure if one means that they're the color khaki as well or another color.
From what I was Googleing this morning, khakis and chinos are used interchangeably in the US a lot, but both are a different type of trouser.
Nice trousers are new to me, only since I've joined this site in the past couple days have I even heard of chinos.
I grew up doing construction, prior to my current job, I had 1 pair of khakis and a white button down shirt for dressy occasions :)