T-Shirt
Shoulder
Name the shoulder, then ask for the change you want: wider tip, longer past the natural shoulder, a lower tip, or a soft curved drop. The same request works in pattern terms or relative to the shoulder landmarks on the avatar.
Examples
How to prompt
Say shoulder or shoulder tip, then the change: wider outward, longer past the natural shoulder, lower at the tip, or a curved dropped line. Landmarks such as neck sides and armhole top are the shared names when you think in 3D. See Body Landmarks for the full map.