The cut is intentionally relaxed and boxy, so based on the product details your usual size gives the easy, layer-friendly fit shown. Size down only if you prefer a closer fit.
Yes. It's a plain self-fabric tie with no buckle, so you can wear the jacket open and beltless whenever you like.
No — there are no front pockets, which keeps the front panel smooth under the belt.
It layers over tees, knits, blouses and light dresses, and pairs with jeans or tailored trousers. It's a light layer that works across most of the year.
Yes, there is a smooth satin-look lining throughout, so it slides on easily over other layers.