Thanks everyone for all the advice about picking top stitching thread for bright silver fabric! I washed a bit of the fabric, and then did some samples of the best two thread colours so far. Lefthand fabric is unwashed; top row of stitching Gutermann topstitch 40, bottom row Gutermann topstitch 38. Righthand fabric is washed; top two rows are the Gutermann 40 and the bottom row the Gutermann 38.
Rather to my surprise, the lighter thread (Gutermann 38) looks slightly better on both. The fabric has held up fairly well to washing considering I put it in with a regular wash. I’d normally wash something like this on a gentle cycle. It’s darkened and picked up a few crease marks, which is about what I expected. Not like a previous silver fabric I had where I washed it once and it came out black…
Several people suggested trying out more unexpected colours than grey and I was really tempted, but I haven’t had any spare time to visit a bricks and mortar shop with a fabric sample. And I wanted to get on with sewing the actual garment, so in the end I went with the 38. Here’s what it looks like so far.
Not my greatest ever topstitching, but you can’t unpick on this fabric at all, and it’ll look fine from a normal distance. I find going round the pocket edges on jeans at an even width is surprisingly difficult, even when I chalk a line to follow. It’s very difficult to see the chalk on the reflective surface and I resorted to using black chalk, which has rubbed off on the topstitching thread and darkened it slightly so I might as well have used the Guterman 40 after all. Oh well. I think I have enough fabric left to make a little skirt, so I might yet experiment with a pink or a purple thread!