Schoffel's Lyndon Fleece is the the perfect country gilet. Fern is a great shade for a country look and goes well with a range of other Schoffel options. This quick-dry, breathable fleece performs well as a midlayer or as an outer layer. It's machine washable and can be cinched by the drawcord at the back to achieve a snug fit.
This style is true to size however if you wish to achieve a more fitted look in some cases you can buy down a size. Model is UK size 10 and is wearing UK size 8.