The Donegal overcoat is a traditional Irish coat made from Donegal tweed, a distinctive fabric featuring colorful flecks or slubs in the weave. Unlike the Inverness cape, it's a conventional overcoat without a cape element, typically featuring a single or double-breasted front, notched lapels, and a straight cut. Named after County Donegal in Ireland where the characteristic tweed originated, it exemplifies Irish craftsmanship and rural style.