The Midrash Rabbah brings one piece of clothing they had: Adam's Ketonet:
אָדָם הָרִאשׁוֹן הָיָה בְּכוֹרוֹ שֶׁל עוֹלָם וְכֵיוָן שֶׁקֵּרַב קָרְבָּנוֹ, שֶׁנֶּאֱמַר (תהלים סט, לב): וְתִיטַב לַה' מִשּׁוֹר פָּר מַקְרִן מַפְרִיס, לָבַשׁ בִּגְדֵי כְּהֻנָּה גְדוֹלָה, שֶׁנֶּאֱמַר (בראשית ג, כא): וַיַּעַשׂ ה' אֱלֹהִים לְאָדָם וּלְאִשְׁתּוֹ כָּתְנוֹת עוֹר וַיַּלְבִּשֵׁם, בִּגְדֵי שֶׁבַח הָיוּ, וְהָיוּ הַבְּכוֹרוֹת מִשְׁתַּמְּשִׁין בָּהֶם, כֵּיוָן שֶׁמֵּת אָדָם מְסָרָן לְשֵׁת, שֵׁת מְסָרָן לִמְתוּשֶׁלַח, כֵּיוָן שֶׁמֵּת מְתוּשֶׁלַח מְסָרָן לְנֹחַ...מֵת נֹחַ וּמְסָרָן לְשֵׁם, וְכִי שֵׁם הָיָה בְּכוֹר וַהֲלוֹא יֶפֶת הָיָה בְּכוֹר, שֶׁנֶּאֱמַר (בראשית י, כא): אֲחִי יֶפֶת הַגָּדוֹל, וּמִפְּנֵי מָה מְסָרָן לְשֵׁם מִפְּנֵי שֶׁצָּפָה נֹחַ שַׁלְשֶׁלֶת הָאָבוֹת עוֹמֶדֶת מִמֶּנּוּ. וְתֵדַע לְךָ שֶׁשֵּׁם הָיָה מַקְרִיב שֶׁנֶּאֱמַר (בראשית יד, יח): וּמַלְכִּי צֶדֶק מֶלֶךְ שָׁלֵם וגו', וְכִי כְּהֻנָּה לוֹ נִתְּנָה וַהֲלוֹא לֹא נִתְּנָה כְּהֻנָּה אֶלָּא מִשֶּׁעָמַד אַהֲרֹן, מַהוּ שֶׁהוּא אוֹמֵר כָּאן: וְהוּא כֹהֵן, מִפְּנֵי שֶׁהָיָה מַקְרִיב כַּכֹּהֲנִים. מֵת שֵׁם וּמְסָרָהּ לְאַבְרָהָם, וְכִי אַבְרָהָם הָיָה בְּכוֹר, אֶלָּא מִפְּנֵי שֶׁהָיָה צַדִּיק נִמְסְרָה לוֹ הַבְּכוֹרָה וְהִקְרִיב, שֶׁנֶּאֱמַר (בראשית כב, יג): וַיַּעֲלֵהוּ לְעֹלָה תַּחַת בְּנוֹ. מֵת אַבְרָהָם וּמְסָרָהּ לְיִצְחָק, עָמַד יִצְחָק וּמְסָרָהּ לְיַעֲקֹב...
Translation: Adam Ha'rishon was the first-born of the world and when he sacrificed his sacrifice, as it is said "And it shall please the LORD better than a bullock that hath horns and hoofs.", he wore the clothes of the High-Priesthood, as it is said: "And the LORD God made for Adam and for his wife garments of skins, and clothed them.", clothes of commendation they were, and the first-borns would use them, and when Adam died he passed them on to Shet, Shet passed them to Metushelach, when Metushelach died he passed them to Noach...When Noach died and passed them to Shem, but was Shem the first-born? After all, Yefet was the first-born, as it is said "The brother of Yefet the elder.", so why did he pass them on to Shem? For Noach foresaw the lineage of the Patriarchs was to come from him. And know that Shem sacrificed, for it is said "And Melchizedek king of Salem brought forth bread and wine; and he was priest of God the Most High.", but was the High-Priesthood given to him, after all, the High-Priesthood was only given at the time of Aharon, what it is that is said here: "and he was priest". for he would sacrifice like the priests. Shem died and he passed it to Avraham, but was Avraham the first-born? Nay, but for that he was righteous the right of the first-born was passed to him and he sacrificed, as it is said: "and offered him up for a burnt-offering in the stead of his son". Abraham died and he passed it to Yitzchak, stood Yitzchak and passed it to Yaakov. etc.