I was first clued in to Mishka's shirts awhile back when he nicked a Pop Will Eat Itself logo.
Looking at the site now, he's flipped Lewie for his shirt: http://www.turntablelab.com/clothing/284/809/65462.html
Notice the 'get the balance right' on the shirt? ;)
He's also flipped Happy Mondays "Hallelujah!" design: http://www.turntablelab.com/clothing/284/809/65467.html