Queries :: Unpivot Table With Union Query

I am using below Union Query to unpivot attached table. Basically this is a table with some clothes and their sizes (in yellow). Now my problem is that below query works well only when all sizes are in the same row but as per attachment I may have them potentially over three different rows.

I can determine which row is for which item based on size range column (in red) but I still do not know how to modify my query to look at different rows depending on value of size range column, especially that as you can see there are multiple values pointing out to the same size range i.e. 0-6 and 1-4 point out to Size Range 1.

Unfortunately I cannot change the layout of the table to have all sizes in one row

Code:
Select Field1, Field2, "0" as Size,Field3 as Qty from orderform where Field3 > 0;
Union All Select Field1, Field2, "1" as Size, Field4 as Qty from orderform where Field4 > 0;
Union All Select Field1, Field2, "2" as Size, Field5 as Qty from orderform where Field5 > 0;
Union All Select Field1, Field2, "3" as Size, Field6 as Qty from orderform where Field6 > 0;
Union All Select Field1, Field2, "4" as Size, Field7 as Qty from orderform where Field7 > 0;
Union All Select Field1, Field2, "5" as Size, Field8 as Qty from orderform where Field8 > 0;
Union All Select Field1, Field2, "6" as Size, Field9 as Qty from orderform where Field9 > 0;