Jumper by Heart Dagger, Plain design, Roll neck, Fitted trims, Close-cut muscle fit, Tighter than your average jumper. 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.