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Because there is an obvious difference made between a simple heel of short length and one which is clearly vain and awkward.

Exactly!...that was the whole point of my objection to what Mater said.  Don't understand how you missed that.

Because there is an obvious difference made between a simple heel of short length and one which is clearly vain and awkward.

I don't attempt to define some arbitrary point at which heels become too much to be acceptable at all. What I take offense at is the idea that altering your posture in an unnatural manner makes you "more beautiful" or "more feminine". Even when we discuss makeup, the conclusion usually revolves around acceptable use being in making someone appear more perfect and/or younger than they really are, but still in line with God's design. Heels don't qualify for that distinction. Of course, the taller the heel, the more out-of-sync, but any heel at all is an alternation of natural God-given posture and so they shouldn't be associated with being better than the natural posture of every female. So, in keeping with the theme of the initial part of the chapter, namely that clothing should reflect the human shape, fashioning every outfit with heels contradicts the author's initial argument.

When I was young, I was given the idea that heels are mostly desirable for short people. I can at least understand this perspective as there might be some cultural value placed on taller people (both men and women) and height is occasionally associated with better nutrition in youth. But society clearly no longer treats heels like this even if there was some element of that in the past.