It would probably be best to reference the fit guide online for the men's Thrasher Skate Mag Pullover Sweatshirt since these are from the manufacturers most times. And it is better to use your chest dimensions rather than your weight or height. In my opinion though, considering you mentioned a baggy fit, I believe the XL size would be what you are looking for.
because last time i purchased a Heather Gray colored hoodie, it turned out to be a Gray colored hoodie. Also, the description says its a Heavy duty but it was really a slim fit.
The shade of Grey pictured for the men's Thrasher Skate Mag Pullover Sweatshirt is correct on the website. Also, this is a regular fitted sweatshirt with a armpit to armpit width of 24".