The fit appears relaxed and oversized by design, so your usual size gives the easy drape shown in the photos. If you prefer a closer fit, consider going one size down.
Both. It buttons through like a shirt but is cut roomy enough to layer over a tee or a light knit, which is how it's styled in the photos.
Based on typical corduroy care: machine wash cold on gentle, inside out, then hang to dry. The nap softens with washing and doesn't need ironing.
It's a true three-season layer — the ribbed nap holds a little warmth without weight, so it works over a tee in mild weather and over a knit when it cools.
Yes. Both square patch pockets are real, open pockets with no flaps or buttons, roomy enough for a phone or keys.