My college roommate and I loved throwing wine & cheese parties so for our favorite holiday we dressed up as a Wine and Cheese Couple Costume! I used the sides of a box and wrapped it in foam, then made holes to look like Swiss cheese. A little spray paint, some straps, and presto!
For the grapes we blew up a bunch of purple balloons and stapled them to her purple shirt. We opened a box wine (basically a bag of wine with a spout) and duck-taped the bag to her stomach so the spout poked out from the bottom of the grapes! It was a huge hit but sometimes difficult to get around in the box!