The MAXCT stand-collar nylon jacket is offered in Khaki and Navy Blue, with M, L and XL in the listing. The useful buying question is how much room its chest measurement leaves over the layer you plan to wear, while keeping the shoulder, sleeve and back length in proportion. The chart reports flat-laid garment measurements. It is not a body-size chart, and its model’s M try-on does not establish how the jacket will fit another person.

Compare a jacket you already wear over the same layer

Lay a well-fitting jacket flat, close its front and smooth it without stretching. Measure across the chest at the same level on both sides, then double that width to compare with the listed chest circumference. Write down what you wore under that reference jacket: a tee, a shirt or a thicker knit. Repeat the comparison with the layer you intend to wear under this jacket. If the reference chest is 132 cm and you like its room over a shirt, the listed M is 2 cm smaller, L is 2 cm larger and XL is 6 cm larger. Those are arithmetic comparisons between garments, not predictions of comfort or body fit. The seller notes a 1–3 cm manual-measurement allowance, so a 2 cm difference is especially poor grounds for choosing a size on its own.

Check what changes when the chest goes up one size

From M to L, the chest increases 4 cm, the listed shoulder width 1 cm, the sleeve length 2 cm and the back center length 2 cm. From L to XL, the same four changes repeat. If you need more room for a knit, compare all four dimensions with your reference rather than treating the chest as a single size switch. A larger chest can also move the shoulder seam outward and extend the cuff. Conversely, keeping the shoulder and sleeve close to your reference may leave less space over a bulky layer. The listing does not give hem circumference, armhole depth or lining details, so those parts of layering cannot be calculated from this chart.

For a second worked example, suppose your reference jacket measures 134 cm at the chest, 53 cm at the shoulder, 63 cm in sleeve length and 73 cm from the back neck to the hem. The source-listed L matches those four numbers. If you normally wear that jacket over a light shirt but want to add a substantial sweater, XL offers 4 cm more listed chest, with a sleeve and back length each 2 cm longer. That comparison shows the tradeoff; it does not prove the sweater will fit because the armhole, sleeve width and fabric ease are not supplied. Ask for those measurements if the extra layer is essential.

Keep the fabric claim separate from weather performance

The product source states 100% nylon and identifies a stand collar. A fiber label alone cannot establish water resistance, wind resistance, breathability or warmth. The listing does not provide a membrane, coating, seam construction or test rating. For a planned rainy-day or cold-weather use, seek those specifications before relying on the jacket as protective outerwear. The color selector helps you choose a look; it does not change the missing performance information.

Use the M–XL chart as a comparison worksheet: first match a reference jacket over your intended layer, then compare chest, shoulder, cuff reach and back length together. If your reference falls between listed rows or the missing armhole and hem measurements affect your decision, request those dimensions rather than guessing from a body-size label. Check the current jacket page for the available color and size before ordering.