EN 13402 is an european standard for clothing sizing, it covers sizes from shoes, gloves, socks to jackets, shirts including bras.

Its based on the metric system and makes direct use of different body measurements to be used in different garments, neck, head, hand, arm, chest, leg, and so on.

The EN 13402 standard consists of four parts:

1. EN 13402-1: Terms, definitions and body measurement procedure
2. EN 13402-2: Primary and secondary dimensions
3. EN 13402-3: Measurements and intervals
4. EN 13402-4: Coding system

For bra sizing, this standard will look similar to japanese bra sizing, and the cup step is ever 2 cm