Use the measurements required by the selected chart
The men's chart combines standing height with chest circumference. The women's chart combines chest and hip circumferences. The form shows only the independent measurements needed for the selected chart, instead of asking for duplicate or derived size fields.
Measure close to the body
For chest circumference, keep a flexible tape level under the armpits around the fullest part of the chest while standing straight and relaxed. For hips, measure the widest part of the hips and buttocks with the feet together. Avoid measuring over ordinary clothing and repeat the measurement if tape placement is uncertain.
Let the larger required measurement control
Each applicable measurement is matched conservatively to the largest published chart row whose lower boundary it reaches. This resolves overlapping chart ranges toward the roomier row. If height suggests one row and chest suggests a larger row, or chest and hips disagree on the women's chart, the calculator recommends the larger row so the tighter measurement is not ignored.
Read US and EU labels as chart designations
US results use letter sizes while EU results use even-numbered jacket sizes. They are paired labels from the published chart, not direct unit conversions. The same letter can cover more than one EU row, so retain the EU number when comparing products.
Confirm the seller's own size chart
There is no universal jacket sizing standard. Brand grading, garment cut, fabric, intended ease, insulation and layering can change the best fit. A boundary match is a chart recommendation rather than a guarantee; use the manufacturer chart and returns policy before purchasing.