Start by mixing the cornstarch and the glue. Add the vinegar, body lotion and glycerine, keep mixing. Warning: it will be messy! But mission on, the texture will improve the more you combine the ingredients. If you find at this point that the mixture is too flimsy, add a little extra cornstarch until the mixture is smooth, soft and squishy. Prepare a clean countertop with a little cornstarch and spread out the mixture. Knead it as you would dough for bread.
Top Tip: dust your hands with a little cornstarch to prevent the mixture from sticking to your hands. Once the clay mix is firm but still soft and pliable, you can cover it with plastic and set it aside while you prepare the doll.