What are some themes in The Devil Wears Prada?

I think that one of the themes that comes out in the book
is what evil can look like.  The fashion element emerges quite prominently in this
exploration.  How some of the most beautifully clad people can do some of the most
horrible of things is a part of this.  Miranda is one of the most well dressed,
impeccably groomed individuals, an embodiment of class.  Yet, her treatment of others,
in particular Andrea, helps to bring out how cruelty and evil is not something that
looks disarmingly awful.  Rather, it exists in what we might place a great deal of value
upon and to which weight is added.  At the same time, I think that another theme is the
notion of understanding one's identity.  The fact that Andrea no longer wants to emulate
Miranda is a part of this and a theme that makes the novel representative of character
exploration as well as redemptive.