What does this mean?

Then bring Aaron and his sons to the meeting tent’s entrance and wash them with water. Dress Aaron in the holy clothes. Anoint him and make him holy so that he may serve me as priest. Then bring his sons and dress them in tunics. Anoint them like you anointed their father so that they may serve me as priests. Their anointing is to the priesthood for all time in every generation. Moses did everything exactly as the Lord had commanded him. (‭Exodus‬ ‭40‬:‭12-16‬ CEB)

12‏ וְהִקְרַבְתָּ אֶת־אַהֲרֹן וְאֶת־בָּנָיו אֶל־פֶּתַח אֹהֶל מוֹעֵד וְרָחַצְתָּ אֹתָם בַּמָּיִם׃
‎13‏ וְהִלְבַּשְׁתָּ אֶת־אַהֲרֹן אֵת בִּגְדֵי הַקֹּדֶשׁ וּמָשַׁחְתָּ אֹתוֹ וְקִדַּשְׁתָּ אֹתוֹ וְכִהֵן לִי׃ ‎
14‏ וְאֶת־בָּנָיו תַּקְרִיב וְהִלְבַּשְׁתָּ אֹתָם כֻּתֳּנֹת׃ ‎
15‏ וּמָשַׁחְתָּ אֹתָם כַּאֲשֶׁר מָשַׁחְתָּ אֶת־אֲבִיהֶם וְכִהֲנוּ לִי וְהָיְתָה לִהְיֹת לָהֶם מָשְׁחָתָם לִכְהֻנַּת עוֹלָם לְדֹרֹתָם׃
‎16‏ וַיַּעַשׂ מֹשֶׁה כְּכֹל אֲשֶׁר צִוָּה יְהוָה אֹתוֹ כֵּן עָשָׂה׃

<idle musing>
See the difference there? Aaron is in "holy clothes" and his anointing makes him holy. The sons are wearing tunics and anointed "like their father" but they aren't made holy. What's going on here?

The Vulgate is very terse here:
adplicabisque Aaron et filios eius ad fores tabernaculi testimonii et lotos aqua indues sanctis vestibus ut ministrent mihi et unctio eorum in sacerdotium proficiat sempiternum fecitque Moses omnia quae praeceperat Dominus.

No distinction between the sons and the father... The Septuagint, on the other hand, makes an even bigger distinction than the Hebrew:
καὶ προσάξεις Ααρων καὶ τοὺς υἱοὺς αὐτοῦ ἐπὶ τὰς θύρας τῆς σκηνῆς τοῦ μαρτυρίου καὶ λούσεις αὐτοὺς ὕδατι καὶ ἐνδύσεις Ααρων τὰς στολὰς τὰς ἁγίας καὶ χρίσεις αὐτὸν καὶ ἁγιάσεις αὐτόν, καὶ ἱερατεύσει μοι· καὶ τοὺς υἱοὺς αὐτοῦ προσάξεις καὶ ἐνδύσεις αὐτοὺς χιτῶνας καὶ ἀλείψεις αὐτούς, ὃν τρόπον ἤλειψας τὸν πατέρα αὐτῶν, καὶ ἱερατεύσουσίν μοι· καὶ ἔσται ὥστε εἶναι αὐτοῖς χρῖσμα ἱερατείας εἰς τὸν αἰῶνα εἰς τὰς γενεὰς αὐτῶν. καὶ ἐποίησεν Μωυσῆς πάντα, ὅσα ἐνετείλατο αὐτῷ κύριος, οὕτως ἐποίησεν.

They use a different verb for the anointing of the sons versus the anointing of Aaron: χρίω versus ἀλείφω. Not sure how much to make of that—the Hebrew uses the same word, משׁח, the standard word for anointing.

Still mulling all this over in my mind. Is it significant that Aaron's garments are described as holy and the sons' are just tunics? Do the "clothes make the man" so to speak?

Just an
</idle musing>