Sayyiduna Ibn Mas'ud (may Allah be pleased with him) said, concerning the saying of Allah Almighty: "There is no sin upon them if they put aside their garments without displaying their adornment" [Surah al-Nur: 60]: "It means the outer cloak."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8990