I cut the spiderman t-shirt down using one of his looser pajama tops as a guide, leaving a margin for sewing it all up, and cutting off the sleeves and reattaching them once I was ready to assemble everything. The bottoms, similarly, I cut out using one of his pairs of bottoms that were a little loose. All you have to do is fold the pants in half, cut along the outside of the pant leg and around to the crotch(again, leaving a margin for sewing it all up), fold this over and use it as a guide to cut out the rest of the leg, then repeat on the back of the t-shirt or whatever fabric you may be using. Using currently owned clothing is a great way to make your own patterns and it helps you to see how things are constructed. This also means that you'll be more likely to get a really good fit, using something that already fits well!
|I ended up using the neck of the gray t-shirt as the waist band for the pants...perfect! The rest goes to the scrap bucket ;)|