Well I finished the tiny sweater last night and blocked all the pieces carefully to the correct measurements. This morning when they were dry I sewed the seams on one side, and shockingly:
It doesn't fit. Who could have predicted such an outcome?
FYI - when The Professor took this photo, he told me I needed to stand up straight because my shoulders were crooked - I mocked him. Lo and behold, my shoulders definitely are crooked - I think I must have been trying to compensate for the circulation being cut off to my arm because of the tiny armhole, because now that the sweater is off, my shoulders seem perfectly even. Honest.