This is a multi-structured garment made up of nylon, cotton, and jersey sections.
It's labeled as an XS, but since most of it is jersey, it's stretchy and doesn't feel too small.
Specifically, I think it's fair to say that the 56 cm width is equivalent to a size M in other brands I know.
For reference, the seller is a lean, muscular man who is 174 cm tall and weighs 75 kg. He was able to put the jacket on without any discomfort.
 
The Diesel K Thompson jacket is an elegant model with excellent protection that keeps you warm and fresh at all times, thanks to the nylon panels that facilitate breathability and also offer a different fabric effect for a casual and versatile look.
Specified size: XS (equivalent to M)
The jacket is not tight because it is elastic.
・Shoulder width 44cm
・Width 56cm
・Length 74cm
・Sleeve length 65cm.
 
This jacket for men is made with wool and cotton, to offer softness, comfort, warmth, and elasticity. It comes with a lined hood and hem with adjustable drawstring, ribbed cuffs and hem, and it closes with a double system with zipper and snaps buttons. You can use it in your day-to-day activities with denim pants and casual shoes to achieve a modern and elegant style.
Crafted from wool and cotton yarns, this hooded jacket is a plated ribbed knit with a subtle colour variation. Nylon and sweat fabric panels provide a texture clash. Detailed with tonal logo embroidery on both sleeves.
 
Features:
- Regular fit
- Drawstring hood and toggle hem
- 2 pockets
- Double closure: two-way zip or snap buttons
- Lined at hood
 
Specifications:
- Editorial Composition: 50% Wool, 50% Cotton
- Contrast 100% Cotton