Runs extremely small

I'm a big guy thus me buying this thing and buying the largest size. I bought a 4x to be safe just in case they ran small. Boy was I right. They run so small that a 4x is actually like a large. I dont know what sizing they go by But this thing is extremely small. I couldn't even pull it together let alone zip it. I'm a big guy not a huge guy. This thing runs significantly smaller than they say.

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