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@Chopsicle
completely on the right track here - it's a hot-melt film that's come unstuck, just like a glue-stick in a gluegun. However, there's a wide range of types of film, defined by melting point, thickness, and stretch/non-stretch, so first see if you can re-apply the existing film - I suspect this is a stretch film for jersey, so slightly tricky to get hold of from domestic suppliers.
Make sure you have a solid surface to press on to; a lot of ironing boards are a lightweight mesh, meaning you don't get a consistent connection for stuff like this. Place something like a wood offcut under the ironing board cover/foam base, to give you a solid platform to iron on.
On the inside of the garment, lay a slightly-damp cotton tea towel laid over the top - although polyester has a relatively high melt-point, it's good practice to avoid direct heat damaging the fibres/discolouring. Press and increase the temp until you can tell the film has melted/rebonded. When you've got to this melt point, give it a really solid, 10 sec press - or more if needed.
Even if they've not come apart, it's probably worth running over other similar seams while you're at it.
....and if this fails, yes, Bondaweb - or similar - will do the trick, but won't give the same amount of stretch. I often double, or triple up the layers if I need a more solid-finish. Dead easy to use, but reccommend some baking paper between the iron and the garment; this stops any stray edge glue contaminating the iron, and staining other items down the line. ...and if you wanted to be 100%, stitch along the edge of the folded hem.
@hazzelfrazzel where abouts are you? If you're SE, I can drop some film to you, no problem