

Will these trousers dye well to charcoal navy? Worried about polyester thread staying beige
I want to dye these trousers a deep charcoal navy / inky blue but I’m scared of ruining them.
There’s no material label, but they feel like cotton or cotton/linen (matte, slubby texture, wrinkle easily).
My biggest concern is the stitching - I assume it’s polyester and I really don’t want obvious beige thread left behind after dyeing.
Has anyone dyed trousers like this successfully?
Questions:
- Do these look like a good dye candidate?
- Is there any dye/process that gives the best chance of darkening BOTH fabric + thread?
- Would you do navy, charcoal, or blue-black to minimise contrast if the thread doesn’t fully dye?
I’m in the UK so product recommendations I can get on Amazon/locally would be amazing.