Measure the narrowest part of your waist and the widest part of your hips and buttocks.

Brand Size US Size EU Size Waist Hips
M 0-2 32-34 23-26 in
(59-66 cm)
33-35.5 in
(84-90 cm)
L 4-6 36-38 26.5-29 in
(67-74 cm)
36-38 in
(91-97 cm)
XL 8 40 29.5-32 in
(75-82 cm)
38.5-41 in
(98-104 cm)

Natural silk has little stretch. For the best fit, consider sizing up.