Us Weekly has affiliate partnerships. We receive compensation when you click on a link and make a purchase. Learn more! Packing for a Greek vacation is one thing. Finding a dress that can handle sightseeing, long dinners by the water and every photo in between is another. Luckily, Sofia Vergara may have just found the ultimate suitcase staple — and you can steal the look for just $20. Vergara was recently spotted soaking up the sun in Greece wearing a black spaghetti strap bodycon maxi dress styled with slip-on raffia sandals, a matching raffia shoulder bag and white cat-eye sunglasses.…