Ответ:

  1. The four countries are England, Wales, Scotland and Northern Ireland.
  2. England: Morris-dancing clothes; Wales: a tall black hat and traditional Welsh dress; Scotland: a kilt and tartan clothes; Northern Ireland: traditional Irish step-dancing clothes.
  3. People usually wear modern everyday clothes, but they wear traditional clothes on national holidays, at festivals and for special performances. A famous example is the Scottish kilt.