Playing field hockey in heels! Wow! Looks like she was really playing too.
The tartan coat looks very nice on Kate, I can see both sides of the "ill fitting" issue, I would attribute it more to the McQueen styling; pocket flaps, and the skirt beginning higher in the back than the sides, and Kate's poor posture for the appearance of poor fitting.
At least the plaids match! She can wear the dark colors, and does have the height to pull off the large skirt, thankfully it is just long enough, would be even nicer with a few extra inches.