Well the way I made mine was to take two t-shirts and cut them apart and put them together again. The shirts can be altered to have the seam down the middle and as for the collar, well you could either make one and attach it to the top or take one from a different shirt and attach it on.
I hope I explained it well enough....
Natsume(Tokyo Ravens)|Wukong Gudako(Fate/Grand Order)|Nefertari(Fate/Prototype: Fragments of Blue and Silver|Ibaraki(Fate/Grand Order)|Ruler Martha(Fate/Grand Order)|Attlia, Swimsuit DLC(Fate/Extella)|Player Character(Pokemon Sun/Moon)
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Originally Posted by .PapercutSenvy.
...You are now dubbed the Persona ninja.