Why are all these jeans so big???

Does anyone have any issues with buying jeans from the big sellers? I want ACN jeans SO bad but I swear all these sizes are MASSIVE, even the smallest sizes have a waistline of like 78cm. I'm not like super skinny too, so I'm wondering if this is a universal issue or just me...

These sellers also primarily cater to Chinese customers as well, so why are all these sizes so big man...