Wanna see how I did it?
Buy a white shirt, ours is be-sparkled, we happened to have the space yak vest that we added to the ensemble, make her a blaster holster, do her hair in intricate side of the head buns and call her Leia. Done.
Not too tricky.
Check out these other Leia costume posts:
Rebel Insignia Blaster Holster
Let your kids design their costumes