Working on stitches and seams may cause trouble even when it comes super user-friendly tools like Substance Painter. Here is a MultiTool pack by Substance Tools (no way affiliated with Allegorithmic) that might save you some time.
MultiTool Pack features:
- A tool for Substance Painter that allows users to paint a wide variety of stitches and seams for clothing assets. Paints all PBR channels, AO, and Normal.
- Full alpha set.
- NDO alpha template.
This tool, of course, requires Allegorithmic’s Substance Painter.