I agree, that the openings on latex gaskets and socks are made to a specific diameter, and the fabric of the leg cuffs are sewn to match. However, IF the latex boot/sock opening diameter is smaller than the fabric cuff opening diameter, and IF the latex of these hazmat boots is stretchy enough, one could: shove a cone-shaped mandrel down into the leg so that the cuff is fully expanded and tight around it; and then stretch the sock over the cuff and glue it there.
I don't know, however, if these hazmat socks have sufficient durability and puncture/tear resistance to to worth the effort. If they last 1/2 as long as a latex sock that's built for drysuits, and they cost 1/2 as much, then it's not worth it, because you have to invest your time (and some Aquaseal) in swapping them out. But if they last 3/4 as long, or cost 1/4 as much, then maybe it's getting close to worthwhile. I don't think it's a huge life-or-death issue, since you'd probably notice damage to the sock when putting the suit on, and as long as you're wearing booties or sandals over the socks, they're unlikely to suffer catastrophic damage in actual use.
Bent Shaft Canoe Paddles
Full Size Sail Rig
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