▁Vietnam ese ▁people ▁which ▁was ▁popular ▁used ▁from ▁ 1 8 th ▁century . ▁ ▁The ▁word ▁v ấ n ▁means ▁wrap ▁around , ▁co il ▁around . ▁The ▁word ▁k h ă n ▁means ▁scar f . ▁ ▁History ▁▁ ▁After ▁the ▁Tr ị n h - N gu y ễ n ▁war , ▁the ▁residents ▁in ▁Qu ả ng ▁Nam ▁( C ang lan ▁- ▁the ▁Southern ) ▁began ▁to ▁adapt ▁to ▁some ▁custom s ▁of ▁Champ a , ▁one ▁of ▁those ▁was ▁" v ấ n ▁k h ă n " ▁- ▁wrap ▁the ▁scar f ▁around ▁head . ▁First ly , ▁wrapping ▁scar f ▁around ▁head ▁can ▁avoid ▁inten se ▁hot ▁climate ▁in ▁South ▁Central ▁Coast . ▁Second ly , ▁the ▁purpose ▁of ▁that ▁act ▁is ▁to ▁pre en . ▁▁ ▁In ▁ 1 7 4 4 , ▁Lord ▁N gu y ễ n ▁Ph ú c ▁K ho át ▁of ▁ Đ à ng ▁Tr ong ▁( H u ế ) ▁decre ed ▁that ▁both ▁men ▁and ▁women ▁at ▁his ▁court ▁wear ▁tr ous ers ▁and ▁a ▁g own ▁with ▁buttons ▁down ▁the ▁front . ▁That ▁the ▁N gu yen ▁L ords ▁introduced ▁ancient ▁á o ▁d à i ▁( á o ▁ng ũ ▁th ân ). ▁The ▁members ▁of ▁the ▁ Đ à ng ▁Tr ong ▁court ▁( s ou thern ▁court ) ▁were ▁thus ▁distinguished ▁from ▁the ▁cour ti ers ▁of ▁the ▁Tr ị n h ▁L ords ▁in ▁ Đ à ng ▁N go à