In general, often times the small box on the TV screen states 'Garment Measurements', which means that those measurements are the measurements of the garment, not the person. So, I measure my own garments and then order similar sizes. As far as WWC/Renne's pants, I size up because I don't like tight pants (on myself).
'More or less', 'Right or wrong', 'In general', and 'Just thinking out loud ' (as usual).