How to safely shrink a man's XL T-shirt to about a Medium/Large?

I went to Big Day out this year and I got an Avenged Sevenfold T-shirt that I was in love with. xD They only had it in XL but I'm about a men's medium, MAYBE a large, but I doubt it.

How do I SAFELY shrink the shirt, without ruining the color or anything?

I don't want it to fade. :[
 
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