I ordered the (boring) gray knit jackets in P4 and P2 just to be safe. I am generally P4, but occasionally they can be a bit big. The P4 somehow looked off on me, but it didn't scream too big, only that the sleeves were too long. P2 almost never fits me, but this one did. It did not pull at the bust which is generally my problem with P2s, but maybe it is because this jacket does not have side seams. The jacket weighs more than I expected. I am still exploring how well this jacket's length plays with my wardrobe.