In this dp studio technical file, a clear and simple approach to the tailored jacket with shoulder strap seams but no side piece (4 pieces) is given. With its precise written instructions and detailed sketches, the file will bring you a full understanding of the method to follow step by step for a top-of-the-range result in the size of your choice. This jacket comprising four pieces (front, back, side front panel and side back panel) is constructed using the 2-piece tailored jacket as a starting point. The shoulder strap seams go from the shoulder down to the jacket hem, on both the front and back, separating the front and back into two pieces. There is no visible side piece as it is integrated in the front and back pattern pieces. This new base can be adapted to the tailored sleeve and collar. You can use this base to create many other models (coats, tailored jackets…) and it can be used in parallel with the following: The technical file of the tailored sleeve base pattern The technical file of the puffed sleeve The technical file of the tailored collar The technical file of the shawl collar.