In reply to your question about undergarments. I and several friends were invited to a Scotish wedding. We were all expected to wear the traditional costume. Preparations were made that this French contingent including myself would be equipped with said costume at a reputable outfitters in Glasgow.

The day before the happy day the troup set off to the aforementioned outfitters. Each was presented with the appropriate kit and like you the question was asked and the reply was.....nothing.

So picture if you will 15 Frenchmen and one Brit standing proudly in the church grounds waiting for the ceremony to begin and praying ferverently for the wind to stop blowing and the that the Scots to stop smiling at us in that " first time in a kilt" kind of way ; )

All the ladies on the forum will understand that I never realised how cold a church bench can be until your wear a kilt.