I used an old TNT shirt pattern, and made the following changes:
1. Lengthened and A-lined to calf-length.
2. Added breast pockets with white top-stitching.
3. Made a cuffed sleeve with tab
4. Added a back yoke, with tab and white top-stitching.
The seams are Hong Kong finished and bound armholes, and lace tape on the hem.