/cgl/ - Cosplay & EGL

Question for anyone that might not mind to help.
I've gotten into Free! incredibly late and was wanting to put together a bag / outfit.
Can anyone suggest a good place to get the yellow shirt they wear under their jackets with the small emblem on the front and the mascot on the back?
Pic related is my first purchase for a small Makoto Ita shrine.(Might somehow incorporate it into my bag.)
>sage for slight off topic and blogging.