Clothing Size Conversion Charts

Size conversion charts that some online retailers put on their product pages are a quietly brilliant piece of interface design that solves one of the oldest problems in buying clothes remotely. Better implementations let you enter your height, weight, and 1 measurement, chest or waist, and they return a recommended size with a confidence percentage and a note about whether the garment runs large or small. Simpler versions just show a table mapping US sizes to EU, UK, and Asian equivalents, with centimeter measurements for each size. Either way the chart reduces the return rate, which is good for the retailer and good for anyone who has ever ordered 3 sizes of the same shirt just to find the right one. Making the chart accessible without cluttering the product page is the design challenge, and the best implementations use a modal that overlays the page when you click a sizing link.