Exodus 28:39 deals with the one of the last pieces of the High Priest Garments - The White Tunic and The Embroidered Sash. Let's take a look:
39 וְשִׁבַּצְתָּ֙ הַכְּתֹ֣נֶת שֵׁ֔שׁ וְעָשִׂ֖יתָ מִצְנֶ֣פֶת שֵׁ֑שׁ וְאַבְנֵ֥ט תַּעֲשֶׂ֖ה מַעֲשֵׂ֥ה רֹקֵֽם׃
39 And thou shalt embroider the coat of fine linen, and thou shalt make the mitre of fine linen, and thou shalt make the girdle of needlework.
This white tunic was actually first piece of clothing that the High Priest (Aaron) would put upon himself (save for the undergarment, of'course), and as the description says it was a plain white garment made of fine linen. Like so:
Next, the description discusses the Turban that I have already covered in my previous post - the one with the golden plate. The only thing that this verse clarifies is that the Turban was also made of fine linen.
Now, the description moves onto the so-called Embroidered Sash (or Belt). Verse of Exodus 28:39 does not provide any information about it, however the parallel verse of Exodus 39:29 explains that this Sash was to be made of "of corded cambric with blue, purple and double-dipped crimson, the handiwork of as embroiderer". Like so:
Please note that this was the Sash only for the High Priest. The other priest wore Sashes made out only of fine linen. Here is the rendering of the above Sash upon the High Priest:
And here is the complete rendering of the High Priest in all of the garments I have covered so far: