After pinning the crotch seam is an excellent time to check fitting - it's much easier to adjust the fit before you sew the crotch seam. Turn the trousers the right way out and pull them on. If they are too big, you can pin inside to indicate any changes needed, and re-sew the inside leg seams if necessary.
- cut the pieces a bit smaller so I don't have to adjust and re-sew. I already cut down my paper pattern in anticipation.
- make sure I cut both pieces in the same direction on the fabric (which means, for a vertically-oriented print, buying 3 yards to be sure of having enough)
I have my eye on some Kokka fairytale fabric for the next pair, just got to save up a bit of money first!