Crochet - Granny Spike Stitch - leaves fewer gaps, because the second double crochet is crochet through the top of the second double crochet of the row below. Possibly use a dc,tc, dc pattern in the clusters? From Do It Darling.
This lightweight and airy crochet vest is designed with the gorgeous Lion Brand Unique Yarn in Jewel. The bright changing tones give this simple design a big visual impact. This back of the Unique Shell Vest is constructed in one piece.