OK, felt the need to show this because apparently there is no certainty about how correct measurements are taken and would like to clarify things and eliminate the possibilities of misunderstandings and disputes.
First of all, you need a measuring tape. Don't come with a yardstick, this is for a different job.
Shoulders. The easiest. Jacket should be zipped up all the way, laid flat on a table, grab the shoulders and pull until...
How to measure a jacket correctly tutorial
First of all, you need a measuring tape. Don't come with a yardstick, this is for a different job.

Shoulders. The easiest. Jacket should be zipped up all the way, laid flat on a table, grab the shoulders and pull until...
How to measure a jacket correctly tutorial