I can't argue the keeping me away from sharp objects, especially in a white dress. For Kit's I used polymer clay so the necklace was just squares that I pushed together a little for the shape, I strung them on elastic cord so it didn't actually undo, it just sliped over her head, do you think that would work with the sintra? The belt I laced ribbon through eyes I made on the sides then just tied it, the problem was, it wasn't strong enough and it broke (the belt, not the ribbon). Also the whole thing was on a much smaller scale, that's why I didn't want to use polymer clay for mine (Especially the belt). To fasten what about using some gross grain ribbon with a clip? I think I have some white with clip in a box somewhere. How bendable is the sintra? would it open up enough to slip it on and just clip it closed at the back if it went all the way around with a taper or do you think it should be open at the back, like 3/4 around with some kind of belt across the back?