So, I guess this is a thread to post pics of women in traditional belly-baring dress/outfits/costume. Obviously the most famous examples are the saree in India, belly dancing outfits in Egypt, and carnival outfits in Brazil. I also seem to have found that women of the Dai ethnic group in China like to show of their belly buttons (here’s some links).
https://www.chinadaily.com.cn/m/dehong/2010-07/27/content_11055084.htmhttp://www.cits.net/china-travel-guide/dai-nationality-a-legend-of-dancing.htmlhttps://www.pinterest.com.au/pin/286752701261194399/http://www.chinadaily.com.cn/china/2007-04/16/content_851448_4.htmhttp://www.china.org.cn/photos/2015-04/15/content_35323806_10.htmhttp://www.china.org.cn/wap/2013-04/15/content_28545989_4.htm