Hi, Steve. Anna and I are going to this event as well. Last year there was a wide variety of dress, from formal doublets to Jacobite shirts, pantsuits to formal gowns. I saw at least one T-shirt. The band itself was dressed in their black short-sleeved buttoned shirts, open-necked. The PM considers Burns to have been for the "common man", and so doesn't see the need for formality of dress at the supper. Anna will give Bobbie a phone call.