What do you think a pilot of Sisters of Battle/Soroitas like heavy vehicle or jet looks like? Like say a Castigator or Thunder Hawk pilot? Do you think she'd be in the usual shapely power amor of the sisters or would it be more like a nun or cleric take on regular pilot gear?
No idea! For a heavy vehicle like the Castigator or the Thunderhawk, I think a Sister of Battle can wear her usual uniform. For jet vehicles, though, she should wear something lighter so that she can catapult herself out without any problems, for instance if the Avenger aircraft is falling bombed by filthy heretics and xenos. And she needs to be ready to join the battlefield and fight as soon as she leaves the pilot’s cabin. I doubt cleric or nun attire would fit in this case.
I did a sketch how I see a Sister of Battle pilot:
