JP to Letter leggings size
The short answer
By the formula, JP 13 is Letter M.
No brand chart we have checked prints both systems, so this table is the arithmetic alone. Treat it as the label convention, not a fit.
| JP | Letter |
|---|---|
| 3 | XS |
| 5 | XS |
| 7 | S |
| 9 | S |
| 11 | M |
| 13 | M |
| 15 | L |
| 17 | L |
| 19 | XL |
| 21 | XL |
| 23 | XXL |