I don't know much about traditional Asian clothing, but I'd guess maybe some kind of linen for at least some of it? You should be able to find something suitable at Jo-Ann's. A stretchy material would look very costume-y and out of place, so yeah, no spandex.
Done: Captain Malcolm Reynolds, Eleventh Doctor, Captain Levi (SnK), Captain Jack Harkness, Vash the Stampede, The Kid (Bastion), Booker Dewitt, Arno Dorian, Jaime Lannister (S01-04), Connor Kenway, Mad Max, Shay Cormac, Jaime Lannister (S04-05), Otso Berg, Jacob Frye
In progress: Jacob Frye 2.0
Future/considering: Snake/Big Boss (MGS3), Spike Spiegel, Mako (LoK), Poe Dameron, Arno Dorian 2.0, Aldo Raine, General Hux