Q: Is it permissible for women to wear their head covering in a certain fashionable style where one attaches a hair clip to back of head so when wearing the scarf it resembles a “hump”?
A: If the hair is tied in a bun at the back of the head with a scarf wrapped the bun as is common among womenfolk, then this is permissible. However, the bun is tied on top of the head, or the hair is made up into a style on the top of the head with a scarf covering the top, then this will resemble the hump that Rasoolullah (sallallahu alayhi wasallam) prohibited. This hair-do will not be permissible.
And Allah Ta’ala knows best
Mufti Siraj Desai