Depending on your height, this could be either a dress or a tunic!
Personally, at 5'5" it hits around mid thigh. I feel more comfortable wearing it with a pair of skinny jeans, leggings or denim shorts. Fit through the bust, and flowy through the bottom striped fabric.
It has pockets!
Sara is a size 8, typically wears a Medium and is shown wearing a Medium.
Measurement across the bust, with the garment laying flat:
Small 16" // Medium 17" // Large 18"