Interesting halacha sheila on wearing a hat(umbrella too) on shabbas in Shulchan Aruch and Mishna brura 301:40( http://hebrewbooks.org/pdfpager.aspx?req=14171&st=&pgnum=169&hilite=)
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Interesting halacha sheila on wearing a hat(umbrella too) on shabbas in Shulchan Aruch and Mishna brura 301:40( http://hebrewbooks.org/pdfpager.aspx?req=14171&st=&pgnum=169&hilite=)