Dressing young girls in trousers
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Question: Some women dress their young daughters in trousers, and thereafter dress them up in an ‘abaa.ah (full-length outer garment covering a female’s body from head to toe).What is the ruling regarding this?

Response: That which I am of the opinion is that the young girls should not be dressed in trousers, since from one angle - this does away with their humility, and from another angle – there is a rule amongst the people of knowledge, (and that is) ((whatever is haraam for the elder (female) to wear is (also) haraam for the younger (female) to wear)); (in that case), I am of the opinion that the young girl should not be dressed in trousers, even if she is covered with an ‘abaa.ah.

Shaykh Ibn 'Uthaymeen
Silsilah Kitaab ad-Da'wah (12), al-Fataawa - Volume 3, Page 189-90