I liked being girls in games, being one myself, but that was the first time I ever truly considered being a dude when there's an option.
A labyrinth with no exit.
At least the Corrin wear pretty much the exact same fit, F! Byleth or even a simple redesign that adds a better cloak, more armour and coverage are way prettier.
Besides, contrary to popular sentiment Summer Corrin isn't that interesting.
The wiki can be found and contains resources and guides.
Ultimate Well I decided to make my own version for Ultimate.