- Body skimming - Full length - Seam detailing - Open back - Tie waist - Bar tacks at hem - Rigid Italian denim. 100% organic cotton - Low impact wash Our Open Back Column features signature DALA seam detailing, an open back and a fixed tie at the waist for further shaping. Cat is 5ft 8" and typically wears a UK size 8. Here she wears a DALA waist size 26.