I note what Sir William said in his original post,but I wonder if there is some minor trans-Atlantic confusion? Three,perhaps it is four, of the UK members that have posted on this thread, regard a ceilidh as a rather informal bash/dance and are all pretty much agreed(amazingly!) that the dress is pretty informal. On the other hand you chaps across the pond seem to have a different definition of what a ceilidh is. Am I wrong? Also it seems to me, that you chaps over there want to be more formally attired as well? Nothing wrong with that! Just an observation.