I have read several PDF patterns that call for Decovil. On facebook people say when you turn a bag with Decovil there are no wrinkles. Living in the US it is not readily available. Do any of the Bontex compare to the Decovil? I have used Pellon Timtex but it wrinkles.
Use a thinner Pellon, there is a heavy Pellon I believe Pellon in the 650 series. It will not wrinkle but give you great bod, Bontex will wrinkle when turned. You can get Decovil on Esty but it is expensive, it is shipped from Europe.