Tam size guides are fairly accurate. Check them, don't pick the same as your european size as it'll be different. I find the shirts quite a bit longer than the real ones at comparable sizes.
Claudius how do I know who has investments in Adidas? We could look where the Kroenkes put their money too. At the end of the day its all fucked. From stuff I've read most of these fake factories are old Nike and Adidas factories that get shut down, they move from China to Vietnam, Phillipines, etc then some local business guy, I'm sure shady in their own right, will open the fake factory usually with most of the now unemployed staff that already worked there.