This is a UK 18, not a US 18, but the fit was larger than I expected. PTP is 29", flat bicep is 12", length is 36" The Mimi is a thigh length dress with long sleeved, full, cuffed sleeves and a rounded neckline. It features an oversized wave edge collar with DM broderie detail along the collar and cuff. •100% Organic Cotton •Mini length •Broderie detailing •We recommend sizing down for a neater fit •Made In India