I’ll spare you the details other than to say I just wrote this context clues worksheet on the adjective de rigueur. I don’t know how often this modifier shows up in speech, but it certainly is in common enough usage in prose to teach it to high school students.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.