Previous reviewer is right - the sizing on the listing isn't UK. In fact I'm not sure what it is. I ordered a size 34 and actually got a UK size 30". I expected it to be way too small (I usually wear a 32 or 34 inch) but the costume fits brilliantly. Feels just like a 34 inch so I'm not sure whether the sizing is incorrectly labelled.
The colour is gorgeous (I bought purple). Not the shade of purple in the photo - more of a deep magenta type of colour. So all in all, the sizing is weird but it fits and the costume is a lovely colour and I'm happy with it.
This is a nice costume however the sizing is german not UK so unfortunately the "40" size I ordered which is the UK size I take for this item was in fact a UK "36" so I have had to return it. The web site does not make this clear about the sizing.