An-Nur 24:60

WalqawaAAidu mina annisa-iallatee la yarjoona nikahan falaysaAAalayhinna junahun an yadaAAna thiyabahunnaghayra mutabarrijatin bizeenatin waan yastaAAfifna khayrunlahunna wallahu sameeAAun AAaleem

And women of post-menstrual age who have no desire for marriage - there is no blame upon them for putting aside their outer garments [but] not displaying adornment. But to modestly refrain [from that] is better for them. And Allāh is Hearing and Knowing.

And those old women who have no hope for marriage, there is no sin on them, if they take off their (extra) clothes while they do not display their adornment. Still, that they refrain (even from this) is better for them. Allah is All-Hearing, All-Knowing.