Shirt by Heart Dagger, Cutaway collar, Button placket, Skinny fit - cut very closely to the body, Exclusive to ASOS, You heard it here first. Heart Dagger welcomes ASOS to The House of Heart Dagger with an exclusive tailoring collection. A House which has been built on the very foundations that it strives to uphold and take forward: timeless style, rich fabrics, precision-cut suits and a touch of modern-day dandy.