How is D-size measured for body belts?

The measurement of D-size for body belts is specifically taken from hip bone to hip bone. This is because the D-size is crucial for ensuring that the body belt fits snugly around the hips, providing a stable anchor point for safety harnesses and ensuring that the weight and forces in case of a fall are distributed properly. The design of the body belt is such that it needs to rest on the hips rather than higher up on the body, which can create discomfort and insufficient support. In this way, measuring the D-size correctly is vital for both safety and comfort while working at heights.