It follows standard US sizing, same as BDU's.
It's probably best to buy one size smaller because the OTV's are pretty big, especially since most people don't put all the padding and fake plates in them.
Off the top of my head, medium is 38-41" chest. Look for IBA interceptor sizing or something like that on ebay. If I managed to find the NSN of each individual cover, you should be able to find the sizes lol
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