Hmm ... that link seems to be going in a circle. For a recent website illustration I did for a local civic group I used the DAZ freebie cap and parented (not conformed) the DAZ Shepherd's Robe. Any of the robes would probably have worked. The figures were Luke and Laura so it was a matter of scaling, pose adjustments and hiding visible body parts. As well as retexturing, of course. Fairly easy and quick to do for a one-shot static render. If you are doing animation or multi panel work (comics or book illustration) this method probably isn't practical.

You could also try conforming the available robes to one of the M3 or D3 to young teen morphs available in the free section here or on the forum I mod at: http://poserpower.com/phpBB2/index.php