Traditional Harrington jackets are a statement of classic style and simplicity. But as an alternative to the traditional (and more common) G9, how about this G4 from Baracuta.
This two pocket Harrington jacket with fully vented back replaces the usual elasticated waist with belted adjustments. Likewise, there are button adjustable cuffs instead of the G9’s elasticated ones. There’s still a tartan liner and one internal pocket, plus two way zip and two-button fastening collars.
This one is in the rather smart "lotus green" and sells for around £120.