Free Crochet Pattern: Wave Stitch. Use Google translate. http://www.4blog.info/school/2013/scuola-di-uncinetto-tutorial-del-punto-onda-wave-stitch/
Weaving in Wonder Top - Mid-length, Casual, Boho, Vintage Inspired, 70s, Grey, Solid, Crochet, Tank top (2 thick straps), Summer
Crochet for Beginners...Best site I've seen. Great to use as a reference if you already know how to crochet.