I am making a very simple top, just one piece front and back. The pieces include a short sleeve. My first attempt was too snug at the bust, but freedom at the sleeves was fine when I moved my arms front or back. For my second attempt, I customized the pattern at the bust, which now fits fine. Now when i move my arms front or back, the sleeve area is binding, even though it is not tight to my body. I’m not sure how to address this — is the sleeve-area seam too low? Or is the problem to do with curve or relationship to the rest of the garment? Advice appreciated.