I've always been curious about this and whether anyone else has noticed this about themselves. I have been a 12/14 for the last decade, sometimes smaller depending on the shop and the cut of the item, never bigger. HOWEVER, size guides suggest I should be wearing a size 20. My hips are 44 inches. I have at times followed their guidance and bought the recommended size and it is far too big. Anyone else find that their measurements and clothes that fit don't match with size guides from that same shop??