The bust area is open at the sides, so waist and hip measurements are more important to find your fit. The waist measurement is taken at top side button, this hits below your natural waist.  You can adjust the bodice/total length using the buttons on the straps. I think these overalls look best fitting slightly loose.  

Garment Measurements

Size S/M L/XL XXL
Waist 82cm 100cm 112cm
Hips 110cm 120cm 128cm

 

In the photos Tina wears a S/M and Lucy a L/XL.