The History of the Raglan
The raglan sleeve was first drafted as a solution to a very specific challenge: an amputated arm. FitzRoy Somerset, the first Baron Raglan, was injured in the Battle of Waterloo and lost his right arm. The Baron worked with his tailor to develop a one-piece sleeve construction with a diagonal that spans from the neckline/collar, around the shoulder joint to the underarm. This innovation allowed the Baron Raglan ease of dressing and the arm movement required for him to wield his sword using his non-dominant left arm and continue his military career.
Understanding the origin of the raglan sleeve can help us understand how it should fit: more relaxed (less fitted) to the shoulder joint to allow for full arm movement and comfort in the garment.
All images by Kim McBrien Evans.