I don't know how historically accurate that jacket is-- it looks pretty Hollywood History of the Highlands to me-- but I would think it would be within anyone's reasonable skill set to be able to make a wearable copy. You might try asking if someone knows where you could get a pattern for it, or something reasonably similar. You might also ask Woodsheal or some of the other "living history" boffins to give you their opinion as to how historically accurate the jacket is.