The wartime battle dress sizes had nothing to do with Nato sizes other than they used numbers. You sort of are correct but I THINK size 9 was extra tall extra large. Beyond that I think it was custom manufacture. We did recruit one ex basketball player who was nearly seven feet tall. His clothing didn't even have size marking. I had to deal with recruits for several years and part of start up duties was helping QM staff kit the troops up. We didn't have too many of the size 9's. I also can't say if the UKicon did things exactly the same. Now the system is four numbers. I was 7336 shirt and 7334 pants. 73 inches tall and 36 inch chest. Either system is easy to use once you're used to it.
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