With your arms at your sides, you notice an excess of fabric and lines running diagonally over the front of the shoulder and down across the bicep.
Switch from Full Shoulder/Armpit Fit to (Very) Tailored Shoulder/Armpit Fit
We developed the Tailored Shoulder/Armpit Fit specifically to help reduce the amount of lines and fabric at the front and back of the shoulder. While all dimensions remain the same, the Tailored Shoulder/Armpit Fit changes the angle and curves where the sleeve attaches to the body so that the sleeves more naturally point downwards versus straight out to the sides. Thus, this area will look cleaner and have less extra lines showing. The only tradeoff is slightly less range of motion at the shoulder.
The Very Tailored Shoulder/Armpit Fit takes this adjustment even further, providing the cleanest look with significantly less twisting lines around the top of the sleeve when arms are at rest. The tradeoff here is also the same, with range of motion reduced even more.
Reduce the Sleeve Width slightly
Reducing the Sleeve Width so that it is tighter around the upper bicep will also reduce the amount of lines that show around the shoulder. Try decreasing the Sleeve Width by 0.3″ or 0.5″.
Double-check that the Yoke Width is correct
If the Yoke Width is too wide and the seams of the yoke hang past the ends of your shoulders, this can cause extra lines around the front and back of the shoulders. If the Yoke Width of the shirt is in on the wider side, consider decreasing it by 0.3″ to 0.5″ to bring it up just a bit higher on the shoulder.