Musannaf Ibn Abi Shaybah 6342 — Praying in a single garment

Sa'id bin Abi Hind says: I sent a slave boy of mine, who was a scribe and an accountant, to Sa'id bin al-Musayyib to ask him whether one may pray in a shirt without a waist-wrap (izar) under it. He said: There is no harm in it if the body does not show through it.