Vintage 60's Mustard Yellow Corduroy Utility Jacket

The tag has been removed so I don't know what brand it is. Very good condition for it's age!! One button on the pocket is missing but there is an extra button attached to the inside so it can be replaced! Pit to pit is 22". Length is 29" and sleeves are 25". It has belt loops but no belt. I'm guessing at the size so please refer to measurements!