I think Mathilde just wears her normal robes to fancy events, and she doesn't actually use the Grey Wizard Formal Wear at all.
Also all the way back in Turn 1 was this:
Although Mathide was a journeywoman at the time, and I can imagine the rules being slightly different compared to a magister.
Also all the way back in Turn 1 was this:
Thankfully your normal grey robes count as formal dress, because otherwise you wouldn't have a thing to wear.
Although Mathide was a journeywoman at the time, and I can imagine the rules being slightly different compared to a magister.