The Muslim religious dress varies, and various cultures include burqa, chador, niqab, dupatta, or other types of hijab, while others reject all of these dress codes. The religion prescribes modest behaviour or dress in general. A survey from the University of Michigan’s Institute for Social Research conducted in seven Muslim-majority countries (Tunisia, Egypt, Iraq, Lebanon, Pakistan, Saudi Arabia and Turkey), finds that most people prefer that a woman completely cover her hair, but not necessarily her face. Only in Turkey and Lebanon do more than one-in-four think it is appropriate for a woman to not cover her head at all in public. Most respondents say woman whose hair and ears are completely covered by a hijab, is the most appropriately dressed for public. This includes 57% in Tunisia, 52% in Egypt, 46% in Turkey and 44% in Iraq. In Iraq and Egypt, woman , whose hair and ears are covered by a more conservative black hijab, is the second most popular choice. Sikhism Young Sikhs often wear a cloth wrapping to cover their hair, before moving on to the turban. Older Sikhs may wear them as an under-turban. Use while working Practical reasons for headscarf use at work include protection from bad weather and protection against industrial contamination, for example in dusty and oily environments. A headscarf can ensure that the hair does not interfere with the work and get caught-up in machinery since long hair can get into rotating parts of machines, so this is avoided either by means of a suitable head covering like a cap, hairnet or kerchief; cutting the hair short; or by putting on a headscarf. Hygiene also requires wearing a head cover at some workplaces, for example in kitchens and hospitals. Such usage has gone on since about 1900, when women's use of mob caps and Dutch bonnets declined. Workers wore them at work to protect their hair from dirt. Farmers used them to see off the weather and dirt. Soviet labour units of the 1930s and 1940s wore them as part of their uniform (where uniforms were available). This habit was common until about the 1950s in the West for farmers and 1960s factory workers, and 1970s in the former USSR for farmers and factory workers. In popular culture In the modern era, persons may choose to wear a headscarf for religious, moral, or practical reasons. Hilda Ogden, popular character from the UK