《明史·志·卷四十二》
永乐三年，又制定礼冠服饰、皮弁形制，都与太子相同。他们的平常服饰也与太子相同。
永乐三年又定冕服、皮弁制，俱与东宫同，其常服亦与东宫同。
During the third year of the Yongle reign, further regulations were established for ritual coronets and attire, with designs the same as those of the crown prince. Their everyday attire was also the same as that of the crown prince.