Jacobite Era Coat on display at NMS

[Orvis]

Peter,
Having examined an enlarged version of the coat photo, I am of the opinion that it is consistent with the mid-1740's. Highland jackets were somewhat in advance of the rest of Britain in having collars (sometimes appliqued on separately and not part of the body of the coat). The "crail" cuffs with a cuff are of a type that was used in that day on British Army regimental coats, and the short lapels with the three lower closure buttons are also of a type known then (see the portrait of Lord Loudoun in his regimentals). The use of velvet as an ornament was not unknown and certainly could have been used by a wealthy man to display his high status. The only surprise to me was that the tartan is not red-based. My tuppence worth.