To further add to what FrankT and AnAardvark were saying, the new version of Wardrobe Wizard doesn't just alter the cloting to fit a new morphed figure; it can also transfer all the character morphs from a given figure into a set of clothing. First you need to analyze the morphs of the figure in question, which can take a little time, but then it's a fairly quick process to transfer those morphs into the clothing items in question. Even better, you only need to analyze the figure once, and then that morph data is stored as a MOR file which theprogram can access time and time again for any item of clothing you want.

If you are adamant about doing it all in Poser, then your only options would be to use magnets and/or the Morph Tool (if you have Poser 7), and then converting each morph you create into a similarly named morph for the clothing. This would be extremely time-consuming to do each and every morph that the figures use, so shelling out $60 for WW2 isn't really that extravagant an outlay, in my opinion.

JonTheCelt