From what I understand this is a Levis thing. They supposedly use lots of different factories where the product has a surprisingly wide range. For example, on

From what I understand this is a Levis thing. They supposedly use lots of different factories where the product has a surprisingly wide range. For example, one size from one factory will be noticeably bigger or smaller than other. Stretchiness seems to vary also as well as tightness. I had honestly thought this was my imagination of years of using them, but ran into more than one person shopping for jeans that randomly brought this up. I guess Levis super fans can spot each other.