בַּיּ֣וֹם הַה֗וּא יִֽהְיֶה֙ יְהוָ֣ה צְבָא֔וֹת לַעֲטֶ֣רֶת צְבִ֔י וְלִצְפִירַ֖ת תִּפְאָרָ֑ה לִשְׁאָ֖ר עַמּֽוֹ׃
In that day shall the LORD of hosts be For a crown of glory, and for a diadem of beauty, Unto the residue of His people;
Ibn Ezra on Isaiah
In that day, etc. This will be just the reverse of the fate of the crown of Ephraim; for the kingdom of the Lord will appear in Zion.
Rashi on Isaiah
for a crown of beauty for the remaining righteous men among them.