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I have been mostly working on bracelets but want to start working on collars too. With a lot of projects I've been layering leather on top of other leather, for example I'll make the wide base of the bracelet and then on top of that I need a thinner piece that will go into a buckle. The issue is that when I make these items, I'm making them flat. But when I try to put them on, they need to be round. Since the two layers of leather are the same length it doesn't fold into a circle very well. I've been practicing with adding a little bit of length to the top layer to account for that, but it's mostly a guessing game. So let's say I start with a wrist that is 12cm in circumference. If I use a 1/8th inch thick strip of leather as the base layer, the new circumference that the outer layer of leather needs to cover becomes approximately 14cm. But if I cut the outer leather piece to be 14cm in length I have a hard time fixing the two layers together while it's flat. And if I cut both pieces to be 12cm then the outer piece of leather doesn't stretch to fit the new circumference when I try to wrap the finished product into a circle. I couldn't find any good guides on this online but I might be searching with the wrong terms. Does anyone know what the best way to handle this is? I've generally been able to make it work with layering leather but I want to start adding foam and lining some pieces, and I'll be adding a lot of width to the items so I'm worried just accounting for a little bit of extra length in the circumference won't work anymore.

Is it better to use open or closed cell foam for padding leather items? Closed cell would be more firm and wouldn't retain moisture. I'd assume that it would help in the prevention of molding. Open cell foam would be more breathable, which I'd assume would breakdown and or flatten over time plus allow for moisture absorption. I'd also assume that you would not want moisture absorption for something inside of leather because it could draw the oils out of the leather and cause it to dry out easily. I'd also assume that breathable foam could retain moisture and cause molding on the inside. Maybe I'm overthinking this. Doe anyone have any experience with this? Please advise.