In Study of clothing of the executioner to the painting ‘Martyrdom of St. Matthias’, Józef Simmler presents a detailed study of the executioner's attire. The colors are muted, with shades of brown and gray dominating the palette.

The figure of the executioner is depicted in a solemn pose, emphasizing the gravity of his role. The background is minimal, focusing the viewer's attention on the intricate details of the clothing. This work is executed in ink on paper, showcasing Simmler's skill in rendering textures and patterns. The lines are precise, capturing the folds and drapes of the fabric with care.

The dimensions are approximately 25 x 35 cm, making it a relatively small piece. The study serves as a preparatory work for the larger painting, highlighting the artist's attention to detail. Józef Simmler was known for his historical paintings and studies, often focusing on religious themes. This particular work is interesting as it provides insight into the clothing of the executioner, a figure often overlooked in religious art.

It reflects Simmler's dedication to authenticity in his representations. The study likely contributed to the overall composition of the 'Martyrdom of St. Matthias', enhancing the narrative through careful attention to historical detail.