Urban CoCo sizes S through 2XL on most cuts, with some skirts reaching 3XL. The chart below is a working summary from the listings; individual pieces print their own chart in the photos, which wins if the two disagree.
Elastic waistbands stretch roughly 4 inches past their resting measurement. S rests near 25 inches, M near 27, L near 29, XL near 31, 2XL near 33. Pencil cuts stretch less than skater cuts because the fabric is heavier.
Fitted tees and bodycon dresses are cut close: if your bust measurement sits at the top of a size band, the next size up will spare you a wrestling match. Flared midi dresses are roomy through the skirt, so only the bust number matters.
Cropped shrugs are meant to end above the waist; that is the cut, not a sizing error. Open-front cardigans have no buttons to strain, so most buyers stay with their usual size. Ponchos and shawls are one size.
Palazzo and yoga dress pants list inseams around 31 to 32 inches. Petite lengths exist on some listings as a separate dropdown option, worth a look before sizing down.