This one surprised me, being that there a for profit company and sponsors tend to rule but apparently joining FINA to say 100% textile suits for non wetsuit eligible swims. Although the wetsuit rule of 76.1F is still very generous in my opinion. I don't know what United States Triathlon (UST) is doing plus many Tri's like open water events don't subscribe to a sanctioning body so can do there own thing.
triathlon.competitor.com/.../ironman-announces-changes-in-swimwearwetsuit-rules-for-2011-season_8244
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only 70.3 worlds in clearwater non wetsuit
IMKY and Kona are non wetsuit, and now non speedsuit as well.