How to Crochet a Butterfly – video tutorial. For crochet beginner's, it will introduce the weave of simple basic: a chain ring, single crochet (sc), half-double crochet (hdc), double crochet (dc), inc (single crochet increase) and slip stitches. This handmade butterfly can be used to decorate scarfs, hats, bags, dresses, pullovers, cardigans, tops, purses and many other crocheted items.