Attached Link: http://www.morphography.uk.vu/modtut7.html

My conforming skirt tutorial uses the "illegitimate welds" approach, if you need further help with that method. With a skirt that short, you often don't need to group it at all - to be precise, group everything to hip. The joint parameters in the CR2 will take care of everything, as long as the skirt doesn't get within the zone of influence of the thighs or chest. In other words, buttock and abdomen bends will be taken care of without the need for grouping; and this also makes morphs easier to make.