Sizes of items listed in descriptions are approximate and are measured as the overall width laying down flat. 

Bust measurements are flat measurements, and are measured  1" down from the armhole.

X-Small:

Bust 36"

Small:

Bust 37.5"

Medium:

Bust 39"

Large: 

Bust 40.5"

X-Large:

Bust 42.5"

XX-Large:

Bust 44.5"