Cloth can make a pretty big difference. My MTM stuff is pretty consistent in dimension and my pattern has been locked down for a while. I just made myself jacket in a lambswool/ cashmere and a suit in wool/ mohair. While the pattern is the same, the feel of the garments is very different and if I do mohair again, I'll give it a little more ease.
I think you guys should get a tailored jacket and pants made to understand the bespoke process and why things will fit and feel different from a factory made product.Mine is a bit stiff as well and I expect will take at least a season to break in. I just started wearing it a few weeks ago when the weather turned. I don't think I'll do MTM at that price point anymore. Will stick to RTW and maybe go all-in for bespoke if something special comes to mind.
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Measurements are one thing but given the variations in cloth a tailor is able to adjust a bespoke pattern to your frame. Hence the baste and forward fitting.