I got a response from the vendor, and found why.  After injecting the feet into the heels, the stockings don't follow but then setting the feetpose morph to 1 corrected it.

"the stockings has a fitmorph for the feetpose.  Have a look at the BODY of the stockings to find the morph.  The Wardrobe Wizard does not create accurate morphs, it sometimes does, but it often doesn't."

 

I wish I knew about "Include morphs when conforming" earlier.  I tick that on Victoria before adding clothing, that makes things a lot easier.  I kind of wonder why it isn't on by default, would help lots of newbies like me I'm sure.