Because each brand sets its own sizes — and slowly nudges them larger to please customers — there's no shared baseline. That's why your size can swing by two or three numbers across labels, and why a size chart from one brand tells you nothing reliable about another.
The fix isn't trusting the label, it's reading the actual measurements. Compare your body measurements to the brand's published chart, and when you're choosing between brands, a side-by-side sizing comparison saves a lot of returns.
