The pants are reading a polyester make, but I imagine they're supposed to be somewhat canvas-y? If that's the case, the material sculpt could use some finessing to look more canvas-y.
I’m working on a project that needs LowPoly wooden ships. I am a programmer, and I have an illustrator. What we are missing is a modeller. If you feel free and want to work on this project, inform me. Samples: https://assetstore.unity.com/packages/3d/vehicles/sea/low-poly-cartoon-sailing-ships-252027…
Oliverth: In your baking options, where it says Green -Y, try setting that to +Y. Then you shouldn't have to tick Flip Green in your material and Handplane might like it better.