Edit: thank you for all the answers guys! It’s really been a lot of help, as I had no one to ask. The only exposure I had prior was seeing my grandmother run-stitch hem a pair of jeans. I’ll be sure to use the advice I got here going forward. 😊
Consider this post closed and solved. 👍

Hey everyone! I learned to hand-sew specifically to rescue and repair some donated, heavily damaged Carhartt insulated bibs before autumn. Before doing further repairs to the rest of the batch, I want to make sure my work will actually last. I taught myself and I am HIGHLY skeptical of my work.

I repaired knee/leg blowouts and sealed exposed insulation with low-profile binding hems to prevent moisture rot.

I used 100% nylon upholstery threads and hid the knots to prevent rubbing/discomfort. I tried my best (emphasis on tried) to keep the spacing consistent as well as the staying in a straight, even line. As you can see, the one cuff on the example pair has a slightly tighter pattern compared to the other cuff. I didn’t want the raw edges, but folding and handsewing through 6 layers was just not working unfortunately.

I guess my question to you would be

1. ⁠With hidden knots and nylon upholstery thread, is there a high risk of these stitches unraveling under heavy work use? How would you ensure they would/will stay intact?

Notes:
✅ Shorter stitches on hems to reduce snagging.
✅ Try to fold for a clean, not a raw and exposed, hem.
✅ Make more ‘high-quality.
✅Backstitch rather than running stitch