That really depends on how far back you want to go historically. In the late 600's modern day Bulgaria began as the First Bulgarian Empire, in which people are known to have worn caftans (long coats that you can wear on horseback), wool and linen clothing, leather boots, and decorated belts. Later on historically the region was controlled by the Ottoman Empire, so the clothing likely reflected Ottoman tastes.
If you're looking for a simple answer then I'd go with a caftan, long wool pants (tied at the bottom), a linen shirt, leather boots with flat soles, and a decorated belt.
National Assembly of Bulgaria was created in 1886.
Bulgaria Air
National Front for Salvation of Bulgaria was created on 2011-05-17.
National Center for Supercomputing Applications - Bulgaria - was created in 2008.
Highland dress is regarded as Scotland's national dress.
WHAT IS CUBA'S NATIONAL DRESS
National Football Team of Bulgaria
Football
Horo
Rose.
its a kilt.
Rose.