An implantable prosthetic device can include a frame movable between a radially compressed configuration and a radially expanded configuration, and a valvular structure. The frame can have an inflow orifice, an outflow orifice, and one or more commissure windows. The valvular structure can include a plurality of leaflets, each leaflet having a main body with an inflow edge, an outflow edge, and a pair of opposing tabs. Each tab can be paired with an adjacent tab of an adjacent leaflet to form a commissure tab assembly, and each commissure tab assembly being coupled to a respective commissure window. Each tab can extend from the main body at an angle such that a radially outer edge of the tab corresponds to a draft angle of the frame.