The slit high-neck sweater has a chart for shoulder, bust, sleeve, armhole and length across S–5XL, but no slit location or depth. A slit at the side hem would affect layering differently from one near the neckline; the title alone does not establish where it is.

Locate the slit before layering

Ask for a laid-flat front and back view with the slit endpoints marked and a close view of the high-neck opening. If you intend to wear a shirt below, compare the planned shirt’s hem and collar with those openings. The listed S bust is 109 cm, M 114 and 5XL 144; shoulder moves from 56 to 66.5 cm, while body length moves 71.5 to 78.5. That is a substantial width change with a smaller length change, so sizing up to conceal a slit is not the same as choosing a longer top.

Sleeve length moves from 59.3 to 60.7 cm across all eight sizes. Measure an existing top from shoulder seam to cuff and ask how this chart defines its shoulder line. The source lists 95% polyester and 5% spandex, not a tested stretch range. Until the slit position and neck opening are shown, the chart can guide size questions but cannot answer the intended layering question.