I am 6' 1" and was sponsored and worked for SHIFT. Had this exact style suit and they fit exactly like an AStar. For reference, I am 185lbs and the suit fits me like a glove in the 44/54. Great suit, built extremely well and wish it was a 44/54 and I'd buy it. For anyone that needs to try this on forst, they tend to run true to size. Remember, cannot be baggy and will only feel comfortable in the attack position - NOT STANDING UP! If it is tight in the crotch and nether regions, act like a baseball catcher and extend your arms out in front of you while squatted. This will feel better and the way the suit was designed.
Good luck on the sale!