Re'emim
Tachash
Perhaps this leather was made from the animal called Tachash which the Jewish people used as a covering for the Tabernacle in the desert . According to Tanchuma on Parshat Terumah 6, the Tachash had been created only for that purpose at the time. Possibly, here too, the animal out of whose hide these coats of Adam and Chavah were made had been created only for that purpose. According to Shabbat 28, the Holy Ark and other vessels of the Tabernacle were wrapped in the skin of the Tachash when they were being transported. Afterwards, these covers were hidden, never to be found again. Apparently this skin was multi-coloured. This would help to make anyone dressed in it look very distinguished.
Onkelos translates עור תחש as ססגונא “a multi-coloured skin.” The opinion of our sages appears to be that these garments had pictures of all the birds of the world and that Adam bequeathed them to his son Cain. When Cain was killed, they passed over to Nimrod; this is the meaning of Genesis 10,9 והוא היה גבור ציד “he was a very prodigious hunter.” At the death of Nimrod, these garments became the property of Esau. When the Torah speaks of these valuable garments which Esau entrusted to his mother (Genesis 27,15), the word חמודות, “desirable,” means that Esau (also a hunter) had long desired to obtain these garments from Nimrod.
(א) וְזֹאת הַתְּרוּמָה וְגוֹ'. וְעֹרֹת אֵילִם מְאָדָּמִים וְעֹרֹת תְּחָשִׁים. רַבִּי יְהוּדָה וְרַבִּי נֶחְמְיָה. רַבִּי יְהוּדָה אוֹמֵר: חַיָּה טְהוֹרָה גְּדוֹלָה הָיְתָה בַּמִּדְבָּר וְקֶרֶן אַחַת הָיָה לָהּ בְּמִצְחָהּ, וּבְעוֹרָהּ שִׁשָּׁה גְּוָנִים, וְנָטְלוּ אוֹתָהּ וְעָשׂוּ מִמֶּנָּה יְרִיעוֹת. וְרַבִּי נְחֶמְיָה אוֹמֵר: מַעֲשֵׂה נִסִּים הָיְתָה, וּלְשָׁעָה שֶׁנִּבְרֵאת, בָּהּ בַּשָּׁנָה נִגְנְזָה. וְעֹרֹת תְּחָשִׁים, לָמָּה? דִּכְתִיב: אֹרֶךְ הַיְרִיעָה הָאַחַת שְׁלֹשִים בָּאַמָּה. מִי מֵבִיא לְךָ יְרִיעָה שֶׁל שְׁלֹשִׁים אַמָּה. אֶלָּא מַעֲשֵׂה נֵס, לְשָׁעָה שֶׁנִּבְרֵאת נִגְנְזָה.
(1) This is the offering … and rams’ skins dyed red, and sealskins (Exod. 25:3). R. Judah and R. Nehemiah discussed this verse. R. Judah said: It was a large pure animal, with a single horn in its forehead and a skin of six different colors that roamed the desert.9The authorities were undecided as to whether it was a domesticated animal or a wild beast. See Shabbat 28b. They captured one of them and from its skin made a covering for the ark. R. Nehemiah contended that it was a miraculous creature He created for that precise moment, and that it disappeared immediately thereafter from earth. Why is it called orot tahashim (“sealskins,” lit. “skins of tahashim”)? Because the verse states: The length of each curtain shall be thirty cubits (Exod. 26:8). What known animal could supply enough skin for a curtain of thirty cubits? It must, indeed, have been a miraculous creation, which disappeared (immediately after it was created).