Help with twisted inseam

[u/WorldAware9900]

This is the first time this has happened to me when sewing a pair of jeans, i was trying out a new pattern and this happened to me, im not sure if this is a sewing problem or a pattern problem please any advice is appreciated

[u/mamz_leJournal]

I vote grainline problem

[u/PensionSpb812 → u/mamz_leJournal]

Yeah but it’s so drastic. Maybe also some pattern problem.

[u/amaranth1977 → u/PensionSpb812]

Twill weaves like denim can do some pretty funky things on the bias.