Pre-Metric Tropical/Jungle DPM trouser Sizing

Anyone have any idea what the 1-23 sizes for the tropical trousers refer to in human sizes? Apparently the NSNs are 8415-99-132-3770 - 8415-99-132-3792, but other than that I can't find any info online about what each of the 23 sizes are. I can find sizing charts for stuff like No.1 dress oddly enough, but nothing on tropical sizes (and no, they're not the same).
 

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