Quick answer: Button size is measured in ligne (abbreviated L), the international standard for apparel. 1 ligne = 0.635 mm. To find a button’s ligne, measure its diameter in millimeters and divide by 0.635. Example: a 20 mm button = 32L. If you’ve ever seen a button listed as “24L” or “32L” and had no idea what … Continue reading Button Sizes Explained: Understanding Ligne (L) and How to Measure