First question ... when you created the clothing, did you import La Femme at Poser scale into Blender, and then export the same?

Second question ... if you select the clothing and then choose Zero Figure, does it snap back to the proper shape?  I've been finding that resolves this most of the time.  After that, go into the Properties panel and check all of the conforming options. 

This does indeed appear to be something "new" from what I've seen.  I've run into it myself on occasion, everything gets jumbled on the floor. I saw this happen while trying to develop Dawn clothing, but if it's also happening on LaFemme it's not figure relared.