The fit is to scale, and sometime comfortably larger. If you fall between two sizes then the smaller size should be comfortable/ snug. So it'll depend on the kind of fit you're seeking. If you have any questions, feel free to reach out, and if once you order the size doesn't suit your comfort level, there is always return shipping included to make exchanges easier.
A - Chest
Measure around the fullest part of your chest.
B - Waist
Measure the narrowest part of your waistline.
C - Hips
Measure the fullest part of your hips.
Measurements in inches