Relevance of the Scottish Store?

[McMurdo]

Clearly the storekeeper at this tartan shop isn't interested in running a successful business!

You are quite right, funny thing is this Tartan shop is owned by friends of my parents.

Nor are they knowledgeable about who is entitled to wear the Royal Stewart tartan!

Have they seen any pics of royalty in it? I can't say that I have!

Quite right again, I think that she was having a bad day, however to my mind there is no excuse for treating a potential customer that way, nevermind that he would have brought all of his groomsmen there as well.