Hello,
Thanks for your question.
What I do if I were you is this: Try on a few friends shirts if you can and see about the fit you need. I would not just go off the sizing chart as arms are a factor. To give perspective, use this guide for sizing purposes to give you an idea of where you would fit.
I am currently in a 56 SDP at 265lbs. After you try on a few sizes, and do a little homework, you will have a good idea what size to order. You can also look up Ginny Phillips to have it altered perfectly for you. I prefer this method. https://www.powerrackstrength.com/breaking-in-an-inzer-advance-designs-sdp/
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Brian Carroll is committed to helping people overcome back pain and optimizing lifts and movement. After years of suffering, he met back specialist Prof. McGill in 2013, which led to a life-changing transformation. In 2017, they co-authored the best-selling book "Gift of Injury." On October 3, 2020, Carroll made history in powerlifting by squatting 1306 lbs, becoming the first person to break this record. He retired with a secure legacy and a life free from back pain.