i agree with you about cheryl cole..she's just a chav who's been styled to look 'sexy'...what is 'sexy' to you when it comes to style?
Being confident in what you're wearing is the sexiest, good fitting clothes and good posture.
It's not as much what you wear, it's how you wear it.
Showing shoulders or your back, I also think is much sexier than cleavage or legs. Mystery is one of the sexiest and most intriguing things.