I'm 6'4" and  325. I needed a business vest for work, but was a bit worried that, since there are not XL Tall sizes it would not be long enough to both cover my gut and reach my waist. I purchased this in an XXXXL size and a similar model from Ruth & Boaz. This fit beautifully-plenty of size in the body, long enough to cover me, flattering fit, and the quality of the cloth was excellent.
The Ruth & Boaz XXXXL was made as a slimmer fit in the body and did not have enough room around my belly to button it. This fit just as i needed and was long enough in the body to serve as a Tall size.