I really am a beginner so please be gentle with me.
I’m attempting to repair DS’s lunch bag and it has a thin plasticy (?) outer cover with a metallic insulated lining. One seam was completely ripped so I’ve cut it all open at the seams and plan to re-sew it with a fold over top.
However, I’m wondering if I can just use ordinary gütermann polyester thread?
And what type of needle?
I’m thinking a universal needle size 14.
All advice gratefully received.