By knowing the various collar classifications, a general idea of various work environments and job responsibilities can be obtained. But, with the modern world, many careers are a mix of technical skills, physical abilities and technology skills, and no longer are the labels as strict as they used to be. In the modern era, the classification of collar system can be regarded as a convenient categorisation of occupations and not a definitive typology of all occupations.

source... https://managetrix.com/resources/different-collar-jobs/