I’m picturing you dressed as a chef, and then you could attach plastic or papier mache or even paper cut outs of foods (including magazine photos or computer clip art pictures), which represent each of those countries. You can usually get fake food at craft stores or really big floral supply stores for pretty cheap.
So for Ireland you could have a potato, or a loaf of soda bread, or a cup of Irish coffee, or a pint of Irish beer.
For Italy you could have a pizza or a plate of spaghetti and meatballs or an Italian sausage.
For England you could have a block of cheddar cheese or a bag of English muffins or a plate of bangers and mash or a plate of fish and chips or a jar of clotted cream or a crumpet or a pot of tea.
For French Canada you could have a jug of maple syrup.
Some of the items could be fake food from the craft store, and others could be photos from magazines that you have stuck onto a piece of cardboard or poster board to make them stiff and durable. Then attach the items to your outfit with velcro. A couple of wooden spoons and a pot holder would be cute too. Just so everybody gets the gist that you are an International Chef. If you could get a chef’s hat and jacket, that would be most helpful. I’ve seen the jackets at thrift stores lots of times and you can buy the hats, online. The ones for costumes, rather than real ones are usually cheaper, but if you’re handy, you can make one.
Either the mushroom style
Or the tall toque style