I have my white linen Harvey that I had made a couple years ago for the beach at Hilton Head. I wore it to rehearsal, but because it's fairly see-through, I wore it with some yoga pants. My top half felt great, but my bottom half was pretty sweaty.
I was dreading the thought of making another fucking muslin; I just want to sew a garment that fits without having to sew two of them and throw the first away. But it's risky to just sew with your good fabric. Witness the blue-linen-sheath-dress disaster.
But then I had a Eureka moment. I had just worn the white linen Harvey that I made when I was 20 pounds lighter: It fit me just fine. I did notice that the bust dart was too high, so I moved that down an inch, which is not hard to do at all. (For more proof of the vagaries of fitting...the bust dart on the blue linen is still too high.)