I feel like I'm the last person to make this pattern up - I've admired the skirt on so many of my favourite bloggers and finally picked up the pattern when Spotlight did one of their very rare $5 pattern sales.
The pattern goes up to a sz 18 (38-32-42), so I had to grade up about 8" - I did a really simple grade by just adding 2" to each of the side seams. This made the pockets a bit too close together at the front so I widened them to make it look balanced. Lengthened it by about 4"
I took a wedge out of the front length for my tilted waist. Not sure if I should have taken more out or changed the front darts a bit though because it bunches up when I wear it over leggings, can't see it if I wear my top untucked though.