Boyd’s Bible Dictionary:
Much worn in the East as ornaments for the ankles, sometimes with bells (Isa. 3:16-20). [BELLS.]
Concise Bible Dictionary:
The Hebrew word ekes signifies “fetter” or “ankle band.” It is translated “tinkling ornaments” for the feet in Isaiah 3:18, as part of the dress of the haughty daughters of Zion, who liked to make a tinkling noise when they walked; but God would bring to naught all such adornings. The same Hebrew word is translated “stocks” in Proverbs 7:22.