Verse of Exodus 28:40-41 describes most of the garments that Sons of Aaron, the High Priest, had to wear. Namely the linen Tunics, linen Sashes and linen Caps. Let's take a look:
40 וְלִבְנֵ֤י אַהֲרֹן֙ תַּעֲשֶׂ֣ה כֻתֳּנֹ֔ת וְעָשִׂ֥יתָ לָהֶ֖ם אַבְנֵטִ֑ים וּמִגְבָּעוֹת֙ תַּעֲשֶׂ֣ה לָהֶ֔ם לְכָב֖וֹד וּלְתִפְאָֽרֶת׃
41 וְהִלְבַּשְׁתָּ֤ אֹתָם֙ אֶת־אַהֲרֹ֣ן אָחִ֔יךָ וְאֶת־בָּנָ֖יו אִתּ֑וֹ וּמָשַׁחְתָּ֨ אֹתָ֜ם וּמִלֵּאתָ֧ אֶת־יָדָ֛ם וְקִדַּשְׁתָּ֥ אֹתָ֖ם וְכִהֲנ֥וּ לִֽי׃
40 And for Aaron's sons thou shalt make coats, and thou shalt make for them girdles, and bonnets shalt thou make for them, for glory and for beauty.
41 And thou shalt put them upon Aaron thy brother, and his sons with him; and shalt anoint them, and consecrate them, and sanctify them, that they may minister unto me in the priest's office.
First of all, on all images below I'm showing only two sons of Aaron (another) - Eleazar (strength-of-help) and Ithamar (island-erected). I'm not showing Nadab (liberal) and Abihu (father-of-him), as they died due to sin and throughout the wilderness journey only two younger sons of Aaron performed the Tabernacle service.
Secondly, additional details about these garments are provided in the parallel verses of Exodus 39:27-29, so please read them as well. Please note that even though it is not clearly visible on the images below, as Exodus 28:41 states, Aaron also wore a linen Tunic under the Blue Robe and under the Ephod.
Here is the rendering of the first garment of the description - the linen Tunics for sons of Aaron.
As you can see from this image, the next piece of clothing was the linen Sashes for the sons of Aaron. However Aaron himself wore a colored woven Sash.
And the last piece of clothing that these verses describe were the special linen Caps that sons of Aaron would wear. Please note that these Caps were different from the Turban of Aaron and were more, well, of a cap-like form. Also, sons of Aaron did not wear the Golden Plates on their foreheads as Aaron have.
And here is the comparative rendering of the Turban of Aaron vs. Caps of his sons, and the colored Sash of Aaron and the linen Sashes of his sons.
As you can see from the image above, the garments of Aaron were far more majestic and more glorious than the garments of his sons. This is because Aaron was the High Priest and only he was most holy onto God. Not even his sons were deserving of his glory and abilities.