Step 1. Decide what size triangle you would like and then using a pencil and ruler, rule up a template on a piece of A4 paper. Add a seam allowance of 5mm around your triangle (or more depending on how big your triangle is). Cut the template out.
Step 2. Pin the template onto your fabric. Cut out the number of triangles you need x2 as you will need a front and back for every flag (i.e. for 12 flags you will need 24 triangles).
Step 3. With the right side of the fabric facing in, sew along the seam allowance on the longest sides of the triangles.
Step 5. Through the open edge, pull the triangle pockets inside out to reveal the right side of the fabric. All seam lines should now be hidden.
Step 6. Cut away any unwanted thread and excess fabric. Iron your flags so they are nice and flat.
Step 7. To make the line cut a piece of fabric that is 4cm wide and however long you require it to be. Fold the line in half lengthwise and iron. When a clear crease is created, open the line back up and fold the outside edges into the middle as pictured below and iron again.
Step 8. Pin the flags to the line so that the open edge is on the centre crease. When you are happy with the alignment, sew along the line to attach the flags.
Step 9. Iron the completed bunting and PRESTO! Your bunting is ready.