i was at the tannery (the new one, not the downstairs one) in harvard square, and they have the sullivan dress on sale for 50% off (originally $236). i saw a P, S, and M. i recommend sizing up on this. i tried it on at stel's, and it's tight in the chest and short. i was fine with the length in the S, but the buttons were pulling at the chest (and i'm just an A cup).
i also tried on the topsiders, and the shop guy told me they have to fit snug. my heel was slipping out of the 8.5s, and they were out of the 8s, but he said that should be my size. i'm normally an 8.5 or 9, so i'm feeling nervous about buying something that ends up being too snug. it seems like it runs true to size, but do you feel like it's best to wear them tight like slippers (sockless)? i didn't mind the color they had, either, although i still like the lighter color at jcrew best.