"That is, if I go back to Pose room, and change the pose, the cloth no longer fits." Pose your figure and then fo into cloth and "recalculate simulation". This will not take all that long. It >SEEMS< slow to do it that way, but intreality when I add up all the time I spent #@*&('ing with conforming clothing and the figure to scale/hind/fix poke through it is much faster :)