well I went to by a new skirt, and got a size 18, but because the material is stretchy, it's a but too big ( if it had no stretch, an 18 would be fine). So I went to change it, but forgot to take it with me!! (how did I manage that ? ) so bought what I thought was a size 16, but is actually a 14.
Now the 14 is OK, but a bit short..
So I guess. I can "grow into" the 18... or "slim down" into to 14.
So I guess I won't be taking either back now.