Manolo says, here is the Manolo’s latest column for the Express of the Washington Post. Dear Manolo, In August, I have some free time before I begin graduate school. A friend has invited me to spend part of it at her family vacation home on Martha’s Vineyard. We’ll mostly be at the beach, but I’ll still need some sandals to glam it up a bit for when we go out at night. What do you suggest? Beth Manolo says, from the Vineyard of Martha straight into the graduate school? It is like going from the disco directly into the nunnery,…