Quick answer: Most everyday buttons fall between 10mm and 25mm. As a quick rule, use 10 to 12mm for shirts and baby clothes, 15 to 18mm for blouses and cardigans, 18 to 23mm for dresses and jackets, and 23mm or larger for coats and outerwear. To find your size, measure the button’s diameter in millimeters, … Continue reading The Complete Button Size Guide: How to Measure and Choose Buttons