@carinosa the wingspan is not the distance between your shoulders, but the distance between your hands, when you stretch your arms out to the sides horizontally.
@carinosa I'd say that the length should be somewhere between 150cm and 180cm. Using your wingspan (distance from hand to hand when the arms are stretched out) is just an easier way to measure it.
Most people use embroidery floss for friendship bracelets, but other string should work too.
@halokiwi Thank you very much but the hands I have to spread them a lot ? Maybe my questions seem stupid but I'm new to diagrams usually I watched the videos