I attended a ceilidh when I was in Scotland last month and saw considerable difference in what was worn.

Almost all the men wore kilts or tarten trews. The Americans and Canadians tended to dress rather casually - polo shirts or open-necked shirts without a tie. The Scots on the other hand, tended to wear jackets and ties, ranging from tweeds to Prince Charlies. There were a few exceptions of course.

The women tended to wear equivilent attire, from blue jeans to cocktail dresses. Some wore tartan skirts or a sash.

What say you regarding what is proper attire at a ceilidh, whether in Scotland, the US, Canada, or elsewhere.