Anna makes a good point about men's pants. Last year, after DH had lost some weight, I ordered some new dress pants for him from a well-known online retailer in his new size. When the new pants arrived in a 32" waist, they were really big on him. I measured the waist and it was actually closer to 34".
When I called them and mentioned this, they said that yes, a 32 isn't REALLY a 32 because "some men like a more generous fit." What?!? I really thought those numbers in men's clothing had a meaning to them, but apparently not.
Vanity sizing by any other name...