If you don't know what your size is, take a tape measure and stand in front of a mirror.
Wrap the tape measure around the center of your chest, keeping the tape at the same height around the entire perimeter, loosely. Write down the centimeters.
Now circle your waist below your navel keeping the tape measure at the same height and without squeezing.
The hip, measure the widest part of the hip to do so, slide the tape measure over your hips until you find the widest part.
Here you can see the equivalence in sizes. If a size does not correspond to these measurements, you will be notified in the product file so that you can choose the correct size.