If you ever wondered why the sewing instructional books insist that you hang (on a *hanger*) anything cut on the bias (or circle skirts which have both straight and bias) for a minimum of 24 hours before hemming, this is why:
It was all cut very nicely, and every bit of it matched. When it was sewn.
So, since I don't want it to do this in my closet, I do this before I put in the hem.
Standard advice, explained with pictures. :)