CO for size XL to get wider neck line. Other than that followed size M.
Added two german short rows after the ribbing to create slightly higher neck at back.
Added slits at the bottom and a slightly longer back. Pulled the slits forward by 3 st at each side.

June 2023: I cut off the ribbing and made the tee longer with a full skein extra. I realized I wouldn’t get any use of it when it was as short as it was. No problems with colour difference, stitch definition or anything else after a wash. :)