Face mask
Measure from the edge of your ear (helix) across the tip of your nose to the other edge of your ear.
Small 32-33cm
Medium 33-36cm
Large 36-39cm
As a guide, Medium fits like the disposable white/blue mask.
Corsets
30 Under-bust = 63-67 cm
32 Under-bust = 68-72 cm
34 Under-bust = 73-77 cm
36 Under-bust = 78-82 cm
38 Under-bust = 83-87 cm