Albert Barnes Commentary Isaiah 3:17

"therefore the Lord will smite with a scab the crown of the head of the daughters of Zion, and Jehovah will lay bare their secret parts." — Isaiah 3:17 (ASV)

Therefore the Lord will smite with a scab - There is some diversity in the rendering of this expression. The Septuagint reads it: ‘The Lord will humble the principal daughters of Zion’—those who belong to the court, or to the families of the princes. The Chaldee, ‘The Lord will prostrate the glory of the daughters of Zion.’ The Syriac is the same. The Hebrew word שׂפח s'ı̂phach—translated ‘will smite with a scab,’ means “to make bald,” particularly to make the hair fall off by sickness. Our translation essentially conveys the idea; that is, that God would visit them with a disease that would remove the hair, which they regarded as such a great ornament and on which they prided themselves so much.

Few things would be so degrading and humiliating as being thus made bald. The description in this verse means that God would humble and punish them; that those who so adorned themselves, and who were so proud of their ornaments, would be divested of their joyful attire and be carried naked into captivity in a foreign land.