Ghamidi Sahab’s Translation: If they (old women) wish, they may remove their dupatta before men; there is no sin in it. On the condition that they are not desirous of showing their adornments.
Other Translations: As for elderly women past the age of marriage, there is no blame on them if they take off their outer garments, without revealing their adornments. But it is better for them if they avoid this altogether. And Allah is All-Hearing, All-Knowing.
Other translations seem to suggest that the “outer garment” in the verse refers to jilbab, and the older women are allowed to take it off if they are not wearing any adornments.
Also, can you give a little clarification on what “Ghaira mutabarrijaatin bi zeenah” really means?