Aero Tech Designs, on Amazon. Made in USA.

ATD Amazon store: https://www.amazon.com/stores/page/5E4879BF-84D1-4BDD-BBFE-AA416B7373A0

Seller page: https://www.amazon.com/sp?ie=UTF8&seller=A3UWP6O97PUGWJ

Products: https://www.amazon.com/s?me=A3UWP6O97PUGWJ

Edit: I'm 6'9" 250-260 or so and I've had reasonably good luck with Synergy suits in regular XX-large; this is the one I rock on my Saturday-afternoon-kill rides: https://www.amazon.com/dp/B09C2VJP5Q

Not a super high-end brand generally but options are limited. You could do worse (cough Sparx cough). I have the orange, red/white stripes ("Cardinal") and turquoise/blue stripes ("Arctic"). But that's a full suit, not a seperate jersey. Still, something to consider since trisuits that are comfortable and don't pull your shoulders and torso downwards, compressing your spine (EXTREMELY painful) can be difficult to find if you're tall.