In fact size S and M are knitted from the same pattern but by the time I was knitting the M one, MIL and myself were worry the wool yarn might not be enough. Hence, we changed the pattern at the leg casing. Ta-dah! New pattern was borned! Oh yes, I used all 400meter wool yarn and left just a little bit for emergency use which I do not know when will need it.
I realized wool soaker will get bigger after several wash or use more often. Not sure about the wool cover? In fact, no need to get bigger size. Another good point is I have the chance to alter or loosen the leg casing opening when my gal's thigh grew bigger... later still can knit back to its original size. How fun!
Am I going to knit more? Probably... maybe will try wool longies but anyone want to sponsor me the wool yarn?
p/s: Knitting is very challenging... just imagine you have so many undo and redo till almost give up! No wonder knitted wool items are so expensive... But seeing the end products is simply rewarding...