If you are in-between sizes you could potentially size down, model is shown wearing a size medium and Kelly wears a size large. Both could potentially size down if they wanted a tighter fit through the torso.
Aiden & Oak carries a wide variety of lines and the sizing of these products can vary. We include on each individual product page a description of how the item fits. This description is based on a women's size small 2/4, medium 6/8, large 10/12. Please feel free to reach out to our team if you have specific questions about the fit of an item.