What was the 'Neizer ha'Kodesh' (the holy crown)?
Rashi, Rashbam and Targum Yonasan: The Tzitz (on which engraved the holy Name of Hashem).
What does the Torah mean when it writes "Venasata es Neizer ha'Kodesh al ha'Mitznafes"?
Rashi: Because the middle thread ran over the Mitznefes, which, together with the two side-threads that tied with it at the back, formed a sort of hat. 1
Ramban: Refer to 28:37:2:2.
Where did the Kohen Gadol wear his Tefilin?