MONTREAL--(BUSINESS WIRE)--Birks Group Inc. (the “Company” or “Birks Group”) (NYSE MKT: BGI) announced today that comparable store sales during the holiday season (for the period from November 2, 2014 through December 27, 2014) increased by 7% on a consolidated basis compared to last year’s holiday season (for the period from November 3, 2013 through December 28, 2013). Comparable store sales in the U.S. increased by 11%, while Canadian comparable store sales grew by 3% compared to the prior ye