British designers new collection ticked off signature tailoring and motifs while allowing women to have more softnessStrength and fragility were the competing themes at Stella McCartneys Paris fashion week show. The British designers spring/summer 2015 collection used delicate fabrics and loose shapes to achieve the desired effect - with trapeze-cut silk slip dresses, wide tunics and slouchy trousers the ingredients.The extensive collection played to McCartneys strengths, ticking off the signatures she has become known for.