Is it considered a sin to inform the questioner that his sister's husband stipulated that she not wear trousers, whether by implying that his sister was not wearing the proper hijab, or by divulging a secret, especially since the information reached him from his aunt and was not mentioned to him as a secret?
You bear no sin for what you mentioned. There is nothing in your statement that necessitates your sister was not wearing the Shar'i (Islamically prescribed) hijab, nor is it a disclosure of a secret, and nothing is required of you. The one who desires marriage should choose the religious woman.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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