I am usually an xsp or 0p but i ordered up one size (2p) due to previous reviews complaining about the tight slip. however i definitely did not need to size up. the slip is fine and the outer 'shell' is billowy and i should have stuck with my usual size! when i put it on i was not in love due to the dress being so roomy, but a second check in the mirror showed that the fabric / seams draped well and it overall looked pretty cute. it hits about 2 inches above my knees and therefore seems pretty p