שֵׁשׁ־בְּרִקְמָ֤ה מִמִּצְרַ֙יִם֙ הָיָ֣ה מִפְרָשֵׂ֔ךְ לִהְי֥וֹת לָ֖ךְ לְנֵ֑ס תְּכֵ֧לֶת וְאַרְגָּמָ֛ן מֵאִיֵּ֥י אֱלִישָׁ֖ה הָיָ֥ה מְכַסֵּֽךְ׃
애굽의 수 놓은 가는 베로 돛을 만들어 기를 삼았음이여 엘리사 섬의 청색 자색 베로 차일을 만들었도다
Ibn Ezra
From a creature that was known in those days. As it is written, "and gave you sandals of tahash to wear (Ezek. 16:10)." Therefore, it was already known.
Rashbam
בגדי שש, the finest Egyptian garments made of superior linen. We know from Ezekiel 27,7 that such garments formed a well-known Egyptian export.