I've never heard this one before? br> I asked an eBay seller about pant measurements? He said pant waist is labeled 40 but it is now 34 and it actually measures 36. Here's the response... "The tag is marked 40 but they must have been taken in at some point. The actual measurement with the tape measure is 18” across while flat, 36” total. Trouser measurements always leave 1-2” for shirt tuck and not being too tight so if the trouser measures 36” the typical marked size would be size 34. Hope that helps."