Plus size labeling: 1X = US 14W–16W, 2X = US 18W–20W, 3X = US 22W–24W, 4X = US 26W–28W.
The 'W' suffix indicates a 'women's' cut — designed with proportionally larger hip-to-waist ratio than misses sizing of the same number.
EU plus equivalents: 1X ≈ EU 44–46, 2X ≈ EU 48–50, 3X ≈ EU 52–54.
Brands like Universal Standard, Good American, and Eloquii use straight numeric sizing through size 32 — no XS/S/M/L hierarchy. This is more accurate.
If you're between misses (US 12) and plus (US 14W), most experts recommend trying both — the cuts differ in hip room, not just size.