This guy seems like a kid until he speaks, or you see his adult face, whichever comes first. The dragonfly wings are also honestly a little weird. But those robes and the wizard hat look appropriate to the era while also looking good on him; and he has a reputation as a scientist and expositor, so.

"First thing we do for your costume; determine social class. You'll have the most freedom of action with the least questions asked as some kind of liege knight or bannerman; a Lord on a mission for a Count or Marquise. How do you tend to fight, mister...?"

He circles his palm, in a sort of impatient out with it gesture. A bit tactless, this fellow.