The "header" is the top part of the curtain that attaches to the rod. It dictates how the fabric drapes.
Curtains should just barely brush the floor or hover a half-inch above it. Avoid curtains that hang too short. Are you planning to buy ready-made curtains or Curtains
The combined width of your curtain panels should be 2 to 2.5 times the width of the window so they look lush when closed. The "header" is the top part of the