The ready size refers to the garment measurements. The body size refers to the body measurements.

TOPS
SIZE
Body " Ready "
CHEST CHEST WAIST HIP SHOULDER
XXS 30-31 34 30 36 13.5
XS 32-33 36 32 38 14
S 34-35 38 34 40 14.5
M 36-37 40 36 42 15
L 38-39 42 38 44 15.5
XL 40-41 44 40.5 46.5 16
XXL 42-43 46 43 49.5 16.5
XXXL 44-45 48 46 52.5 16.5

BOTTOMS (standard length- 38")
SIZE
Body " Ready "
WAIST WAIST HIP
XS 27-28 26 38
S 29-30 28 39
M 31-32 30 41
L 35-36 34 43
XL 37-38 36 45
XXL 39-40 38 49
XXXL 41-42 40 52

Note: The ready sizes may vary as per pattern of the outfit.