This is a Sebago Dorr Herringuebone overshirt.
Sebago
Kestin
Black Q
Woodbird
Workaday
Nepenthes Online Store
Our Legacy
Portuguese Flannel
Auralee
Taylor Stitch
As Colour
Furore
Jjjjound
Uskees
Merz B. Schwanen
Norse Projects
Aimé Leon Dore
Universal Works
Keen
Museum Of Peace & Quiet