What does “body measurements for an individual are specified” mean? Like body measurements on the size charts are specified? Those don’t tell one of the clothin

What does “body measurements for an individual are specified” mean? Like body measurements on the size charts are specified? Those don’t tell one of the clothing will fit, only that there’s a possibility it will fit. And in reality the ranges they give are far too wide. And one can specify their body measurements all they like, but it barely helps selecting a size online or even in store.