Every common size, drawn at its real diameter on your screen. Compare them side by side, then take a size straight into the try-on or the catalogue.
Tap a row to highlight that range above.
The smallest buttons on a shirt — collar stand and sleeve placket.
The standard dress-shirt placket button.
Cuff buttons on a suit jacket, a size down from the front.
The front buttons on a single-breasted jacket.
Sewn waistband closures, hidden or visible.
Hammered in rather than sewn, so there is no buttonhole.
Follow your yarn weight and buttonhole rather than a chart.
The largest sizes in regular garment use.
Knitwear is the one row that isn't a standard: the right size follows your yarn weight and buttonhole, not a chart. Sizes for babies and toddlers are left out on purpose — sources disagree, and small parts carry a choking risk under three.