What Garments Are Permissible for Prayer and What Garments Are Not

Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 40

Book 1, Chapter 40

فأما لبس السواد للتقية فلا إثم فيه.

However, wearing black for the sake of dissimulation (taqiyya) carries no sin.