Help me find a plastic cone thing? Halloween costume

I’d like to be a martini for Halloween (my girlfriend is going to be the bottle of gin). To that end, I want to find a clear plastic cone-shaped something that I can cut part out of to go around my head. My head would be the olive, my tie the stem, and my belt the base of the glass. I was thinking that one of those dog cones would work well, or a lampshade, but I can’t seem to find either in clear.

Can you help me out? Do you have a better idea for how to make this costume?

The dog thing is an elizabethan collar? Google it, you’ll find clear ones. There are also instructions on making them, so you could get a piece of clear, stiff, plastic and make your own.