adult's clothing, sewing

Whoops

Feeling very proud, I completed hand-sewing the binding around the bottom of the sleeve, turned the blouse the right way out to admire my handwork, and noticed this:

Yes, that sleeve has been set in upside down.  Note to self for future reference:  double-check that the sleeve seam is matched to the underarm seam, not the shoulder seam.  Now to start unpicking …