Graham,

First: That's one awesome avatar! The G squared is a great idea!

Second: I can't believe there's no kilt store in Houston! Too bad you don't have the money to get one started.

Third: here's a site that might inspire some ideas for names of the store.
http://www.britishempire.co.uk/ It may stir up some ideas. Also, if you're going for the entire empire thing, you've got to have some Canterbury of New Zealand rugby jerseys!