I immediately leapt to the defence of women in general and pointed out that someone can be the same weight and height as someone else, yet they might still be different dress sizes. And my friend pointed out that it depends what shop you are in as to what size you would wear (the day I wrote this I had on a size M top, with a size S top over it, and an XS sweater over that. Two of those items were from the same shop. Yes, H&M, I am looking at you and your ridiculously erratic sizing!). Equally, two people of very different height and weight can wear the same size clothing. My friend is probably 6 inches shorter than me and a different build, and yet we wear the same size clothes.
What is your experience of this? Do you find inconsistency in sizing across different (or even the same) brands? Does it bother you when you have to wear a different size to your usual one? Do you share a dress size with someone who looks has a completely different body shape to you?