In one of the promo pics she is wearing the following item which has the same pattern as the jacket (3rd promo of the set, top left image). The patterns from this outfit can be applied individually, and it looks like they applied the pattern you like to a jacket.
As for the jacket in question, you got me!
dForce Bunny Outfit for Sakura 8
https://www.daz3d.com/dforce-bunny-outfit-for-sakura-8
The shirt and tie/scarf would appear to be from the following set, but retextured.
H&C Japanese School Uniforms for Genesis 3 Female(s)
https://www.daz3d.com/h-c-japanese-school-uniforms-for-genesis-3-female-s