The most reliable way not to get the size wrong is to measure a garment that already fits well and compare it with the chart on the product page.
What to measure
Chest width. Measured straight from seam to seam, with the garment lying on a table. In the chart, it’s usually half the circumference that’s listed.
Garment length. From the top point of the shoulder to the bottom hem.
Sleeve length. From the shoulder seam to the cuff.
What to do about a one centimeter difference
Nothing. A cutting tolerance of 1–2 cm is normal for knitwear. But a four-centimeter difference is already noticeable on the body.
