Anyway, PSA to no one in particular: sewing is an extremely, extremely useful skill to have, of PHENOMENAL usefulness, and it's a shame it's not respected as such (at least, not in the US -- and based on the extremely low value placed in sewing worldwide, probably a global thing). So glad the many folks here have pointed me in the right direction on this. And it's also a shame it's been pretty gender-role limited. (at least for me, a straight male...) I highly recommend everyone and anyone at least learn the basics (repair and some modifications), but if you're into math/puzzles/3d modeling/etc. it is a natural fit to go well beyond that.
#sewing