I'm no photoshop expert but if it's fake then it's a good one, the print on the fabric covers his body.
You can Photoshop that in about a minute, actually. Photoshop pros can do mind-blowing things equally mind-glowingly fast, this is the easiest of their tricks. Looks fake to me, especially since I remember MK playing in T-shirts in 2005, but not with prints like this.