Another +1 for Aerotech.
Be aware that there are different cuts for cycling shirts so even in the same brand an XL in one line might not fit the same way as an XL in another. Race cut is a tapered close-fitting cut. Club cut is a more generous cut for those of us who don't have pro racer bodies. Sport cut is somewhere in between. Some companies may use different terms but most have at least three basic cuts to choose from.
I'm a larger rider and in addition to Primal and Aerotech, have had good luck with LG's club fit.