I’m normally an Australian size 12 in underwear and these are definitely a better fit. They are the pair on top with the size large underneath. They are approx 2cm narrower at the hip when laid one on top of the other. I also widened the decorative side elastic on the top edge by 1/4″ because I had forgotten to add this allowance for the elastic for the first pair.
The pattern is designed to use fold over elastic. To use the picot elastic I added the width of the elastic (about 1/4″ not including the picot edge) to all the edges to which this elastic was to be applied to allow for finishing.