When we got home, I took the dress out of its box and garment bag - it was the right color! Checked the tag - it was the right size! Tried it on - it fit like a dream. While still knocking on wood, I think I can safely say that the dress drama is pretty much over. :)
Plus, what I didn't tell you before was how wonderful the J. Crew bridal staff at the SoHo store were. I got the dress on sale (for $200) last year when I first bought it. I suspected with the size exchange that I'd have to pay the current price, which was $295. However, after my wrong-color dress debacle, I think the gods at J. Crew decided to smile on me. In the end, the SoHo store staff (say that three times fast!) sold me the dress for the original $200 sale price AND waived the $13.50 shipping. Truly awesome.