In almost every Nantucket shop you'll find a tunic.
Some are made of Indian cotton prints, with or without extensive embroidery; some have been bedazzled within an inch of their hems; some are sturdy solid tunics, with a solid, trusty trim around the neck.
I really wanted to buy one; specifically an Amaya tunic (that's a hand-embroidered detail, to the right), but found that I was between two sizes, and one does want a tunic to fit just right.
So I shall simply raise my glass to this elusive garment.
Seriously: "gin and tunic" sounds like a good summer drink to me. Bartenders: you read it here first!