I used plenty of topstitching in a contrasting red thread on these jeans for my godson Akki

Topstitching needles from Schmetz

Topstitching is when you sew with the good side of the fabric up and your stitches are visible on the finished garments.

While a decorative feature, topstitching can also play a role in garment construction.

You can buy specific sewing needles that are optimised for topstitching