Reference for Yoma 46:14

רבי דוסא אומר לרבות בגדי כהן גדול ביום הכפורים שכשירין לכהן הדיוט

Because it is said: 'And he shall have the linen breeches upon his flesh.' And Resh Lakish? - That the garment must have the proper measure [he infers] from the fact that the Divine Law employs [the word] 'middo' [garment, not tunic]; that nothing may be put on before the breeches, he infers from the words: 'on his flesh'.

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