Is there a rational argument for buying new, broken-in anything?
I agree that chinos are generally best left out of the office. But there are exceptions to this. In those cases, you want the chinos to be as "clean" as possible, and preferably more crisp than broken in. For this reason I echo Mr. Loblaw's comment above: chino's get broken in on their own easily enough - might as well leave them virgin for a couple of months so that you can wear them with a jacket, OCBD and tie to the office if you're so inclined.Actually I like my chinos to look broken in and a little not put together. Chinos are casual wear. For business casual or an occasion requiring a more put together look I go with wool slacks or cords.