Safety Pin Jacket

Step 3 When pinning:

When you close a pin, make sure that you don't have too much or too little fabric inside. Too much fabric bunched up on the pin will cause the material to pucker, too little will let the pin slide around and can cause the shape you make to get messed up as the pin moves out of place. Ideally, you should go for a snug fit like the pin on the far right.