LefibonacciKnit and woven fabrics behave differently after washing, even if you don't throw them in the drier. Combining the two in one garment never works. You could try dry-cleaning, but even then, the results would be hit or miss and it is after all, just a cheap, novelty top--hardly worth the effort.
RayFI agree. I usually wear a XL and got the 3XL and when putting it on it went to my naval. Bloody bogus on the how incorrent the size is on these unless you are a 4ft2, 100pd asian dude.