As you may have noticed, I am a stickler for detail. It took me ages (nearly as long as making the entire banner!) to calculate the proportion for the triangle; I wanted it quite small. I eventually caluclated that the height should be 1.25 times the width of the triangle. How sad is that??
Using the template, I cut the pieces out with my rotary cutter fitted with a deckle blade (quicker than pinking shears)
So, spurred on by my success, I decided to try a belt. I've hankered after one of these for so long and it's not as if it's even particularly difficult; the hardest thing is to pick the fabrics! I used some waistband interfacing, that has slots cut to make it easy to fold.