Pakistani society is largely hierarchical, with high regard for local cultural etiquettes and traditional Islamic values which govern the personal and political lives of people. The basic family unit is an extended family, although there has been a growing trend towards nuclear families because of socio-economic constraints. The traditional dress is Shalwar Kameez for both men and women, while trouser and shirt is also popular among male population. Recent decades have seen the emergence of a strong and rapidly growing middle class in cities like Karachi, Lahore, Islamabad, Rawalpindi, Hyderabad, Faisalabad, Multan and Peshawar numbering over 30 million.