Heels and a pencil skirt are not the best for running after a 18 month old. Enter sporty dresses, so the running seems intentional.
The pattern is from Ottobre Woman 2/2105. The fabric is a medium thick cotton jersey, it looks a bit too floppy on the pictures, maybe a thicker jersey, or neoprene would have worked better. It’s incredibly comfortable though. I’ve finally mastered the invisible zippers too 🙂