Belt size labels are easy to misunderstand because “size,” overall length and fit point are not the same measurement. A sourcing brief should define each one explicitly.
Choose the controlling measurement
Many programs use the distance from the buckle reference point to the center hole. Others define a garment size or total strap length. State the start and end points with a diagram, including whether the buckle length is included.
Define hole layout and grading
Record the number of holes, spacing, first-hole and last-hole position, and how these change between sizes. For ratchet belts, define usable track length and trim instructions instead of using a hole specification.
Connect size labels to real measurements
Create a table for every labeled size and include tolerances. Confirm whether packaging, hangtags and carton assortments use the same labels. This prevents a correct strap from being packed under the wrong size.
Approve measurements on the golden sample before bulk production and retain the signed table for reorders.