I am confused when measure the torso size...
I am confused when measure the torso size as of your measurement guide, my wife is only 154 cm, but I measure her C7 vertebra to her hip bone, they are 57.5cm, and this is over your XL size, so I know there must be somewhere wrong, please help me.
Draw a line between the iliac crests -- the highest points. Measure from C7 to where this line intersects the spine (somewhere around L5 maybe). I am 165cm and take a Small in this pack. Could probably go with the XS. I would think your wife at 154cm would certainly be an XS!