Remember with jacket and pants you'll most likely need nomex long johns and undershirt as well. You might also want to see if the suit builder can add snaps for added protection if you're going the jacket/pants route.
Pyrotect makes custom suits, maybe give them a call to see what can be done. K1 race gear is another one (and their measuring form is probably the best to use).
1989 Merkur XR4Ti: Project Merkur Space Program - Wins: Class C - Colonel and the Sinkhole 2023 | "Heroic Fix" The Pitt Maneuver 2023 | "Halloween Meets Gasoline" The Pitt Maneuver 2022
1980 Dodge Challenger: Most Extreme eLemonAtion Challenger (Rust Belt Ramble 2021 Dishonorable Mention)