For necklines and front/button bands, I use a standard bind-off in pattern, meaning, if I am working a 1 x 1 Ribbing, I bind off in the same rib with the working needle or one size larger (to avoid making the rib too tight). But I have found I want a stretchier bind-off for the bottom edges of sweaters and sleeves. For these I use Jeny’s Stretchy Bind-Off but with a needle approximately half the size of my working needle. This gives me the stretch and memory I like but with a neater-looking edge. Give this a try in one of our Cocoknits patterns, which use this.