I have fallen in love with cowls lately and I love them as a cozy fit, not too loose. In the pattern, I do give instructions for making a cozy fit, loose fit, and baggy fit.
This shell pattern looks gorgeous! Caron Simply Soft yarn works perfectly for this pattern, although you could use any worsted weight (4) yarn as long as you check your gauge. I explain in the pattern how to make a gauge swatch.

Basic Skills Necessary:
Join with slip stitch, single crochet, double crochet (explained in pattern)

Finished size measurements: 8 inches top to bottom,
(Cozy) - 21 inches around
(Loose) - 24.5 inches around
(Baggy) - 28 inches around