Google is not finding this for me.
I'm sure there must be such a thing as blue fabric with a close repeat of the EU stars. Good cotton so it would make a shirt.
All I can find is photoshops of such designs or actual flags, and no I don't intend to wrap myself in a 3'x5' piece of polyester.
(Motivation: we are going to Whitby Folk Week next month, and north-east England was Fuckwit Central over the Brexit vote. This is to make a statement).
----------------------------------------------------------------------------- e m a i l : j a c k @ c a m p i n . m e . u k Jack Campin, 11 Third Street, Newtongrange, Midlothian EH22 4PU, Scotland mobile 07800 739 557 Twitter: JackCampin