If buying T-shirts from the IGG store I recommend buying at least a size bigger, and perhaps even two depending on shrinkage of shirt after wash and if you like your shirts more baggy. Make sure you check the sizing guide (that is in centimeters) as well! I forgot to do that xD
I got lucky and was really fast at entering codes during the JTisallbusiness Castle Clash live stream facebook event and won some shirts.
I ordered them in medium, since medium is what I wear in the US and I was so excited I forgot to look at the sizing guide xD. Silly me... Unfortunately the mediums are pretty tight on me and are also 95% cotton and 5% spandex so I am guessing they are going to become a bit tighter after the first wash and might be a bit too tight for me to wear as it already kinda feels like a tight track uniform T_T
These shirts feel great though and the quality is awesome!!!
I tried on both shirts, the Marauder is my favorite xD