Former working class mean present lower caste people.
You can see Kashmiri Pandits in India having better features than Kashmiri Muslims.
''Better features'' is subjective. Kashmiri pundits now have been mixing with other hindu brahmins and no longer look like kashmiri muslims who still retain their dardic ancestry better. Kashmiri pundits now have features of other Indian brahmins.
Facial features depend on type of ancestors one had in South Asia, not region. Low caste people look the way they do because of less foreign blood in them, nothing to do with work condition.