The Pinch Test for Harness Tightness
How do you know if your harness is tight enough? Give it the Pinch Test.
An outdated method for checking tightness is to stick a finger (or two) under the harness at the shoulder, but because we all have different finger sizes, it can lead to very a loose harness.
It’s never been acceptable to “pinch an inch” of harness for tightness.