Learn how to crochet the waistcoat stitch with this photo and video tutorial. The waistcoat stitch is meant to be worked on one side only of your fabric. Unlike the center single crochet stitch, this means it can be worked flat only if you finish off at the end of each row and begin again at the beginning of the RS of the next row. This makes it a perfect stitch for working in rounds and spirals – the finished fabric is dense and sturdy and lasts a long time. This is sometimes abbreviated as Wst or W st.