i make a list the outfit with dlc in original sleeping dogs vs definitive edition. ru-vid.comUgkxotISosKJ3AYh5Ol69odpvdfeYUTj5sRz - About the fighting style maybe comes with the outfit too in original.
You can beat the Zodiac tournament without the Muay Thai outfit its just hard. Make sure to use the wooden dummy training poles before each mission located on island where the first meeting takes place. It makes it much easier. Or you can just use the Wing Chun outfit and chain punch everyone.
You must Finish all Main Mission (Green), All Cop Mission (Blue), and All Face Mission (Yellow) in Year of the Snake DLC. ru-vid.com/show-UCU-YI1ALGajXadn33ZoTSNgcommunity?lb=UgkxK40EqmmtCO96JY2V0EOUaEm3kvquHCin
Please make sure you finish the cop missions sequentially. I forgot which mission gives the outfit. Please see my cop mission table here : ru-vid.com/show-UCU-YI1ALGajXadn33ZoTSNgcommunity?lb=UgkxngSWxG1vE77iQSOmoG-Vrt0QvW-NxYgl