It looks like you should have used a tailored lining. It would have given you a cleaner look inside the bag. In the flap you could have use a 1/16 foam which is really thin to set your flap up to fold with out creating wrinkles. When you create a tailored lining much of your lining will be a stay. You can look at the clutch lesson in intermediate or as Adona suggested Chapter 4 Borsa por Signora “Coccodrillo”.