Er..aku jumpa ni kata-kata sumone yang femes daripada sini.
As far as I am concern, Allah has given to us the guidelines in fashion, it is on what shoud be covered (the aurah).
In An Nur verse 31:
"And say to the faithful women to lower their gazes, and to guard their private parts, and not to display their adornment except what is apparent of it, and to extend their headcoverings (khimars) to cover their bosoms (jaybs)...." ila akhir ayah..
Er tu bukan 'fashion guidelines' ke?
p/s: the study of the verse, here