The black hooded puffer jacket has S–XL options and a four-measurement chart. Those numbers help you compare it with a jacket you already wear over a sweatshirt. They cannot establish what is inside the jacket: the word “cotton” in the product name is not a shell or fill specification.

Start with a jacket, not a body-size guess

Lay your reference jacket flat, close it, and measure across the chest at the same level on both sides; double that flat width for a circumference. Repeat for shoulder width, sleeve length and jacket length, writing down the exact starting and ending points you used. The listed S/M/L/XL chest figures are 128/132/136/140 cm. Their shoulder figures are 50/51/52/53 cm, sleeves 63/64/65/66 cm and lengths 66/68/70/72 cm. The source says its measurements were taken flat and may vary by 1–3 cm, but it does not define the endpoints. Ask for the seller’s method if a one-centimetre difference affects your choice.

What changes when I move up one size?

Each step adds 4 cm to the listed chest, 1 cm to shoulder width, 1 cm to sleeve length and 2 cm to jacket length. For a hypothetical comparison, suppose your comfortable closed reference jacket measures 130 cm around the chest and 65 cm from your chosen shoulder point to the cuff. M lists 132 cm chest and 64 cm sleeve; L lists 136 cm chest and 65 cm sleeve. M is closer in chest, while L matches the reference sleeve number. Now compare the shoulder and hem on your actual reference jacket before choosing. The chart does not state whether the listed chest is an outside garment circumference or an inside wearable space, so subtraction alone cannot promise sweatshirt clearance.

Does the model’s L tell me which size to buy?

The source says a 178 cm, 58 kg model tried L. It gives no model chest, shoulder or preferred underlayer, and a model’s chosen silhouette is not a size conversion. If you will wear a thick sweatshirt, measure your reference jacket while wearing the same type of layer. Zip or fasten it, raise both arms and sit down; note whether the front pulls, the hem rides up or the sleeves retreat. Compare those observations with the chart, then ask for a closed-jacket measurement and a photo of the jacket worn over a similar layer if needed.

Which material questions remain?

Before treating this as a warm or weather-ready coat, request a separate shell-fiber label, fill-fiber label, fill amount if offered, lining details, and the maker’s care instructions. The page does not establish cotton percentage, down content, waterproofing or a temperature rating. Also ask whether the hood adjusts and how it fits over your usual headwear. Those are purchase questions the size chart cannot answer. For another example of checking fill separately from layer room, see the padded-jacket fit and fill guide.