It looks a little tight across the upper back, but loose in the blades. The back balance a little long. Shortening may elp the gaping vent. THe sleeves could be slimmed a little at the back seam. Maybe the seat is loose or the back rise is a little long. The pants are a little long IMO.
The girl looks proud to be at your side
What do you mean loose in the blades? Is the shoulders not right?