Sizes. My selection of clothing come from Paris and are quite often labelled as being a Size 1, 2, or 3.
In this case a Size 1 would equate to a UK size 8/10. A Size 2 would equate to a UK size 10/12. A Size 3 would equate to a UK size 12/14.
If the sizes are given as XS,S, M, L and XL the this would equate to UK sizing of 6/8,8/10.10/12,12/14.14/16
In the case of Jeans the sizes start at a 34 and go up correspondingly, 34. 36. 38 etc. A size 34 would be a UK size 6 and would rise accordingly 6,8,10 etc.