Cost per item:
coats, & handbags, and boots are the most expensive. These are generally my investment items (sometimes, the investments are so large that Santa Claus AKA DH has to get them for me). These tend to last a long time, though, as my tastes haven't changed much in these areas in, well, forever.
My bags don't last quite as long as coats and boots; I'm seriously abusive to my bags. However, they do last more than long enough that I feel I got my money's worth and then some.
Amount of churn:
Tops first, then pants. My lifestyle and my job chew up clothes at an alarming rate. Even shopping thrift & places like h&m, I spend quite a bit on tops and pants, simply because I go through so many of them each season; I almost don't have time to get bored with tops and pants.
Single most expensive item last year:
The lace tunic I wore to my sister's wedding. I'm so grateful to Angie and all of you for helping me find something that I can see myself wearing repeatedly, styled less formally. It was expensive in relation to my usual budget on a garment, even if it was very moderately priced in relation to a lot of what's available these days. I've already got ideas for wearing it this summer in some 'hard & soft' outfits, so it was a good investment for me