My experience at auctions is that this type of clothing goes for a fairly reasonable price tag, aristocratic connections or no. Certainly less than they would cost new. Queen Victoria's knickers or a sporting shirt that can be framed, hung on a wall and admired will fetch more but the only thing you can do with kilts, breeches etc is wear them and if they don't fit no-one bids. I have to admit this is the first I have ever heard of a Lord Lynedoch although I did know of a Lynedoch Place and Street in the Park Circus area of Glasgow. Don't know if there is a connection and excuse my ignorance but I doubt if there is a large following or even any interest in the individual or his old clothing. I would keep the stuff in the family as heirlooms where someone actually knows about them.