Measure your garment, NOT ON YOURSELF. WE MEASURE ALL GARMENTS LYING FLAT and list the MAXIMUM measurement. This may be slightly different than your measurements taken by measuring yourself with a tape. To find your measurements, the best thing you can do is to measure a garment that fits you well.
Lay your garment flat on a table. Take a measuring tape, tape measure or yardstick and carefully measure all the areas as indicated in the illustration, then double the measurement. Take note of all your measurements and keep that for future reference