This is basically a kind of crosssection of the farthingale with extra
lines. Your diagram should be acurately scaled down, 1mm to 1cm so
that your final measurements are accurate as well. This is how to
draw it:
1. Work out the diameter of the waist (assuming it's a perfect circle). This is the top line (scaled down 1 mm to 1cm). The equation for this is: circumference / Pi (3.14) = diameter 2. Find
your waistground measurement


4. Join
up the shape with lines from the
ends of the waist diameter line to the ends of the stride measurement line. 5. Measure
up the waistground line and

6. Measure
these lines and you have the
exact diameter of each hoop. 7. From this figure, you can work out the circumference using geometry (3.14 (Pi) x diameter). I hope this makes sense...? 