Fun thread!
The TV show Sex in the City could be held up as an example of what chic-lit could be; I could only manage to watch a few episodes (hated it) the men were cardboard-two-dimensional-flat. I remember wondering at the time if it was a sort of backlash to men objectifying bimbos for years in the media.
So, anyways, IF chic-lit is the flashy pastel covers like Janet Evanovich then I love this type of writing. It's fun and frothy and entirely disposable. It's not the coincidence that makes it work but rather the circumstance.
One worthy in this thread mentioned lack of character development over the arc of the series, our hero never learns anything for the experiences. I would look fondly over at Miss Jane Marple and see that she really didn't change over a series of books because her character arrived fully developed. Like sit-coms on television, the fun is putting familiar characters in different scenarios; so, we see Marple or Holmes or Nero Wolfe or any cast on a sit-com dealing with circumstance (it's Christmas at the 4077). It's a different style of writing because it's not about any rite of passage but rather the foibles of society, the outer not the inner.