The half chest measurements published on this site relate to the garment, not the person. These are measured from a point about 2cm below the armhole (outside of garment). Measure a garment you love for comparison purposes; however please be aware that there are many variables such as fabric thickness and stretch which can affect the comparison.
Note also that not all styles have the same fit or measurements; some are designed more fitted than others. So a size XL in one style may have a different fit to an XL in another style. ‘Classic fit’ is reasonably generous sizing, while ‘fashion’ or ‘modern’ fit are slimmer.
In summary, please use the size charts as a guide only, and always obtain sample garments in the correct style for accurate sizing.
Aurora + Cloke women’s sizing is based on NZ/UK sizing. Note this is quite different to US sizing: