Al-Ahzab · 33:59

59. O Prophet! Say to your wives and your daughters, and the wives of the believers: “Let your outer garments you wear hang loosely over you so that your bodies are not revealed to unrelated men.” That is more likely to distinguish them as free women so that they are not subject to harassment like the servant girls are. And Allah Forgiving of the sins of whichever of His servants repents, and He is merciful to them.