Guilder
12-17-2020

Obtained from the "Realm of Legacy", Pyramids of Giza edition. Stats:

Handicrafts +1
Casting +1
Female-only, 120k total fame and court rank of Upper Knight or more to equip

Source: fashionamagiya.blog.fc2.com/blog-entry-1732.html

Alrn
12-17-2020

The official name is "Ancient Egyptian's Noble Dress". In game, it says it needs "More than Lieutenant Junior Grade" court rank.

Guilder
12-18-2020

Thanks! Turns out that Lieutenant Junior Grade is the same rank as Upper Knight, just the Royal Navy version of the same title.