Here was my first attempt at the jewellery bag --- as you can see from the photo, it didn't quite turn out according to the pattern, lol. From all the comments and ideas sent in (thank you!), I tried it again with thinner fabric, and I sewed a wider (5/8") casing.
My second try came out better - it closed more, but it still didn't close completely. Although you can't tell from the photo, that gap is at least an inch wide - that's a pretty big gap :D The bag is so sweet - it really does look like a flower with those petals - with the right fabric, it would be a delightful little bag to present a little gifty in! And others have managed to create their bags with no problems. However, it isn't working *for me*, so I'll just pass on this pattern for the time being - it's actually stressing me out trying to figure it out, and I just don't need to add more stress to my life :)