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I’m not sure it’s elastic but could easily be.
I have an A2 jacket so similarish style. The cuffs are 86% wool, 13% nylon, 1% elastane and the body hem is 100% wool. I wouldn't worry too much about them stretching since they came pretty stretched out to begin with. What I would worry about (a little) is moths. I got a few moth holes. I stitched them up with needle and thread and called it patina.