Oversized red sweatshirts, like 3 of them. Cut a slit up the front and the back of one. cut the front and back of the other two into triangles, and insert them into the slit to make a full gusset, sort of like creating a big pleat in the front and back. Put elastic at the bottom. to tighten it up. Stuff the inside of the whole thing to round it out and push the pleat outward. Wear matching red sweat pants. Get some foam rubber and cut a circle out of it; paint the top red, and and a branch into the top for a stem.
Grapes are easy. Purple sweats, purple balloons, silk ivy. Blow up the balloons, safety pin to body of sweats, bobby pin ivy to top of head.