Verses of Exodus 28:36-38 discusses two more pieces of the Garments of the High Priest- The Turban and a special engraved Golden Plate - The Frontlet. Let's take a look:
36 וְעָשִׂ֥יתָ צִּ֖יץ זָהָ֣ב טָה֑וֹר וּפִתַּחְתָּ֤ עָלָיו֙ פִּתּוּחֵ֣י חֹתָ֔ם קֹ֖דֶשׁ לַֽיהוָֽה׃37 וְשַׂמְתָּ֤ אֹתוֹ֙ עַל־פְּתִ֣יל תְּכֵ֔לֶת וְהָיָ֖ה עַל־הַמִּצְנָ֑פֶת אֶל־מ֥וּל פְּנֵֽי־הַמִּצְנֶ֖פֶת יִהְיֶֽה׃38 וְהָיָה֮ עַל־מֵ֣צַח אַהֲרֹן֒ וְנָשָׂ֨א אַהֲרֹ֜ן אֶת־עֲוֹ֣ן הַקֳּדָשִׁ֗ים אֲשֶׁ֤ר יַקְדִּ֙ישׁוּ֙ בְּנֵ֣י יִשְׂרָאֵ֔ל לְכָֽל־מַתְּנֹ֖ת קָדְשֵׁיהֶ֑ם וְהָיָ֤ה עַל־מִצְחוֹ֙ תָּמִ֔יד לְרָצ֥וֹן לָהֶ֖ם לִפְנֵ֥י יְהוָֽה׃
36 And thou shalt make a plate of pure gold, and grave upon it, like the engravings of a signet, HOLINESS TO THE LORD.
37 And thou shalt put it on a blue lace, that it may be upon the mitre; upon the forefront of the mitre it shall be.
38 And it shall be upon Aaron's forehead, that Aaron may bear the iniquity of the holy things, which the children of Israel shall hallow in all their holy gifts; and it shall be always upon his forehead, that they may be accepted before the LORD.
As the first verse of the description states, there were to be a special engraved golden frontlet for Aaron to bear upon his forehead. Upon this frontlet were to be engraved two words - קדש ליהוה (holiness to Yahveh). Like so:
As Exodus 28:37 states, this golden plate were to be mounted upon the forehead of Aaron (or any other High Priest) with the help of blue lace that was attached to the plate, and over the Turban of twined linen. Like so:
Here is another view of the Turban and the Plate:
And here is the resulting rendering of a Priest in the Turban and with this special frontlet: