|A walking foot is useful for attaching a sleeve, as it will prevent the two layers from shifting. Works especially well on a sleeve because the 2 layers (bodice and sleeve) are variously matched up the bias to straight grain around the armhole. Shifting can easily occur because bias will streatch much more than straight grain. A walking foot is designed to prevent shifting, and this problem is diminished. In my experience, walking feet really hate sewing over pins, so I hand baste the sleeve into the armsyce before sewing.